Chief Election Commissioner:

The Chief Election Commissioner heads over the election commission of India. A chief election commissioner is generally from the civil services background; a person from the Indian administrative service is given priority. The primary duties of the election commission of India include the conduct of free and fair elections in the nation. Most of the polls in the country, be it for the position of a president, vice president, national or state legislatures, are under the direct control of the election commission of India.

DUTY OF CHIEF COMMISSIONER:

1. The chief election commissioner should ensure no discrimination or biases towards anyone while on election duty.
2. He should ensure that elections are held under complete transparency, and nothing is hidden from the people, i.e. the citizens of India who are the backbone behind India’s elections. 
3. The Chief election Commissioner should make sure that there is no manipulation or partisanship during the conduct of elections at his election duty.
4.  The Chief election commissioner has to present a list of all the eligible voters.
5. They should supervise the nomination of a candidate for becoming a part of the elections or a political party.
6. Registration of different political parties.
7.  Monitoring an election campaign and keeping a check on misbehavior or false practices are taken up, if any, while on election duty.
8. Helps the media in covering the elections and the process thoroughly.
9. Keep an eye on the counting of votes.
10.  Organizes polling booths for the conduct of elections and reaches the booth for election duty.
11. Declaration of the results of the election.
12. The chief election commissioner ensures that all election commission rules are followed.

Sukumar Sen (2 January 1898 – 13 May 1963) was an Indian civil servant who was the 1st Chief Election Commissioner of India, serving from 21 March 1950 to 19 December 1958.

• Under his leadership, the Election Commission successfully administered and oversaw independent India's first two general elections, in 1951–52 and in 1957. He also served as first Chief Election Commissioner in Sudan in 1953.Sen was born on 2 January 1899 in a Bengali Baidya-Brahmin family.
• He was the elder or eldest son of a civil servant Akshoy Kumar Sen.
• Sukumar Sen, in his role as the Chief Election Commissioner of India, was charged with overseeing the 1952 Indian General Election, which was the first election in the history of independent India.
• Historian Ramachandra Guha wrote of Sukumar Sen in The Hindu in 2002, on the 50th anniversary of independent India's first general election.

Hence, Option D Is Correct.

Parliament:

Parliament is the supreme legislative body of India. The Indian Parliament comprises of the President and the two Houses - Rajya Sabha (Council of States) and Lok Sabha (House of the People). The President has the power to summon and prorogue either House of Parliament or to dissolve Lok Sabha. The Constitution of India came into force on January 26, 1950. The first general elections under the new Constitution were held during the year 1951-52 and the first elected Parliament came into existence in April, 1952.

Rajya Sabha:

The Rajya Sabha should consist of not more than 250 members - 238 members representing the States and Union Territories, and 12 members nominated by the President. Rajya Sabha is a permanent body and is not subject to dissolution. However, one third of the members retire every second year, and are replaced by newly elected members. Each member is elected for a term of six years. The Vice President of India is the ex-officio Chairman of Rajya Sabha. The House also elects a Deputy Chairman from among its members. Besides, there is also a panel of "Vice Chairmen" in the Rajya Sabha. The senior most minister, who is a member of Rajya Sabha, is appointed by the Prime Minister as Leader of the House.

Lok Sabha:

The Lok Sabha is composed of representatives of people chosen by direct election on the basis of Universal Adult Suffrage. The Constitution of India allows for a maximum of 550 members in the House, with 530 members representing the States and 20 representing the Union Territories. At present, the Lok Sabha has 543 seats filled by elected representatives. The term of the Lok Sabha, unless dissolved, is five years from the date appointed for its first meeting. However, while a proclamation of emergency is in operation, this period may be extended by Parliament by law for a period not exceeding one year at a time and not extending in any case, beyond a period of six months after the proclamation has ceased to operate.

Early Life of S.V. Krishnamoorthy:

• S. V. Krishnamoorthy Rao was born on 15 November 1902 in Shimoga, Mysore State. He received his Bachelor of Science degree from Central College, Mysore University and later graduated with a law degree from Law College, Poona, Bombay University.
• Rao started the National Educational Society at Shimoga which ran multiple high schools and middle schools.
• He worked with many civil society organisations. He was a member of the Executive Committee of the Kannada Sahitya Parishad, Bangalore (1937-1947) as well as the Planning Committee for Industries and Commerce, Mysore (1945-1948) to name a few.
• Rao was elected to the Mysore Representative Assembly (1945-1949). He was also extremely well travelled. Rao visited Japan, Australia, Indonesia, Canada and USA, amongst many other countries, during his life.

Role in India’s Independence Movement:

• Rao was imprisoned for 18 months in connection with the 1942 Quit India movement and took part in the Mysore Struggle – a movement that demanded responsible government for Mysore. He was an active member of the Congress Party’s political pursuits while simultaneously practising as an advocate.

Hence, Option C Is Correct.

 Deputy prime minister of India:

• The deputy prime minister of India is the second-highest ranking minister of the Union in the executive branch of the Government of India and is a senior member of the Union Council of Ministers. The office holder also deputises for the prime minister in their absence.
• The office has since been only intermittently occupied, having been occupied for a little more than 10 years out of the 75 years since its inception.
• Since 1947 India has had 7 deputy prime ministers, of which none having at least one full term. The first was Vallabhbhai Patel of the Indian National Congress party, who was sworn in on 15 August 1947, when India gained independence from the British Raj. Serving until his death in December 1950, Patel remains India's longest-serving deputy prime minister.
• The Deputy Prime Minister of India is the Deputy Chairman of the Cabinet of the Government of India.

Vallabhbhai Jhaverbhai Patel:

• Gujarati 31 October 1875 – 15 December 1950, commonly known as Sardar Vallabhai Patel,
• He was an Indian independence nationalist and barrister who served as the first Deputy Prime Minister and Home Minister of India from 1947 to 1950. He was a senior leader of the Indian National Congress, who played a significant role in the country's struggle for independence and its political integration.
• In India and elsewhere, he was often called Sardar, meaning "Chief" in Hindi, Urdu, Bengali and Persian. He acted as the Home Minister during the political integration of India and the Indo-Pakistani War of 1947.
• Patel was born in Nadiad, Kheda district and raised in the countryside of the state of Gujarat.
• He was a successful lawyer. One of Mahatma Gandhi's earliest political lieutenants, he organised peasants from Kheda,  Borsad and  Bardoli in Gujarat in non-violent civil disobedience against the British Raj, becoming one of the most influential leaders in Gujarat. He was appointed as the 49th President of Indian National Congress, organising the party for elections in 1934 and 1937 while promoting the Quit India Movement

Hence Option A Is Correct .