Adjective : - An adjective is a part of speech that can be used to describe or provide more information about a noun or pronoun that acts as the subject in a sentence.

Degree of Comparison : - In the English language, a degree of comparison is a form of adjective that is used to compare a person or thing possessing the same quality with another. It is related to the adjective or adverb in a sentence.

Degree of Comparison:

• Rama's mango is sweet.
• Hari's mango is sweeter than Rama's
• Govind's mango is the sweetest of all.

In sentence 1, the adjective sweet merely tells us that Rama's mango has the quality of sweetness, without saying how much of this quality it has.

In sentence 2, the adjective sweeter tells us that Hari's mango, compared with Rama has more of the quality of sweetness.

In sentence 3, the adjective sweetest tells us that of all these mangoes Govind's mango has the greatest amount or highest degree of the quality of sweetness.

We thus see that Adjectives change in form ( sweet, sweeter, sweetest) to show comparison. They are called the three Degree of Comparison .

In the question : -

• His writing is the worst of all.
• Indira Point is the southernmost point of India.
• Mahesh is a good friend.

Thus , the Correct Option is C.

Closer

Adjective : - Adjectives are words that describe or modify other words, making your writing and speaking much more specific, and a whole lot more interesting.

Degree of Comparison : - To describe, quantify, modify or identify nouns/pronouns, adjectives are used or reused. Adjectives have their own degrees called degrees of adjectives or degrees of comparison that compare one thing/person to another. 

Example : - This boy is stronger than that. Here , stronger is a degree of comparison as it is used to compare the boy with the other one .

In this question :  Keep your friends close and your enemies closer. The expression “keep your friends close and your enemies closer” means that you need to keep an eye on your enemies..

Hence, option B is correct.

ADJECTIVE :- Adjective are words or group of words that describes people, places or things. for example :- This is a tasty apple. In this example tasty is an adjective which tells us the quality of apple.

Degree of Comparison:

• Rama's mango is sweet.
• Hari's mango is sweeter than Rama's
• Govind's mango is the sweetest of all.

In sentence 1, the adjective sweet merely tells us that Rama's mango has the quality of sweetness, without saying how much of this quality it has.

In sentence 2, the adjective sweeter tells us that Hari's mango, compared with Rama has more of the quality of sweetness.

In sentence 3, the adjective sweetest tells us that of all these mangoes Govind's mango has the greatest amount or highest degree of the quality of sweetness.

We thus see that Adjectives change in form ( sweet, sweeter, sweetest) to show comparison. They are called the three Degree of Comparison .

The Adjective sweet is said to be in the Positive Degree

The Adjective sweeter is said to be in the Comparative Degree

The Adjective sweetest is said to be in the Superlative Degree

The Positive Degree of an Adjective is the Adjective in its simple form. It is used to denote the mere existence of some quality of what we speak about. It is used when no comparison is made.

The Comparative Degree of an Adjective denotes a higher degree of the quality than the Positive, and is used when two things ( or sets of things) are compared .

The Superlative Degree of an Adjective denotes the highest degree of the quality,and is used when more than two things ( or sets of things) are compared .

In the question : -

Geography is _______interesting than history. In this sentence , the correct adjective of quantity that can be placed in the blank part is more as it is used to show the comparison between geography and history .

Thus , the Correct Option is A , which is more .