Direct speech : - Direct speech is used to report or rather repeat the words spoken by the speaker or writer in the way it is told by the speaker .

Indirect speech : - Indirect speech is the way in which you convey what someone said to another person, not necessarily using the exact words of the speaker.

Direct Speech - Changes in Personal Pronoun:

When reporting a speech the pronoun should be changed according to the relationship of the speaker to the person whose speech is being reported. If the spoken words contain a pronoun or determiner in the first or second person, this often changes to a different person in direct speech: The third person remains the same.There is also used quotation marks in direct speech.

• Salil admitted that he would have told his friend to lend him his car.  (Indirect Speech)
• "I would have told my mother to lend me his car", admitted Salil.(Direct Speech)

In the question : -

They said that they had studied their books .

The direct speech of the above sentence is :

They said , " We had studied our books " .

While converting into direct speech , firstly , they is converted into we according to first pronoun , then had and third form of verb and then the objective part their books .

Thus , the Correct Option is B , which is They said , " We had studied our books " .

Direct speech : - Direct speech is used to report or rather repeat the words spoken by the speaker or writer in the way it is told by the speaker .

Indirect speech : - Indirect speech is the way in which you convey what someone said to another person, not necessarily using the exact words of the speaker.

Direct Speech - Changes in Personal Pronoun:

When reporting a speech the pronoun should be changed according to the relationship of the speaker to the person whose speech is being reported. If the spoken words contain a pronoun or determiner in the first or second person, this often changes to a different person in direct speech: The third person remains the same.There is also used quotation marks in direct speech.

• Salil admitted that he would have told his friend to lend him his car.  (Indirect Speech)
• "I would have told my mother to lend me his car", admitted Salil.(Direct Speech)

In the question : -

1. She said that her son was ill .

The direct speech of the above sentence is :

She said , " My son is ill ".

While converting into direct speech , firstly , her is converted into my according to first pronoun and then use is as helping verb and then the objective part ill  .

2. She said that she is cleaning her room .

The direct speech of the above sentence is :

She said , " I am cleaning her room ".

While converting into direct speech , firstly , she is converted into I according to first pronoun and then use am as helping verb and then the objective part her room.

Thus , the Correct Option is A , which is 1. She said , " My son is ill " . 2. She said , " I am cleaning her room " .

Direct speech : - Direct speech is used to report or rather repeat the words spoken by the speaker or writer in the way it is told by the speaker .

Indirect speech : - Indirect speech is the way in which you convey what someone said to another person, not necessarily using the exact words of the speaker.

Direct Speech - Changes in Personal Pronoun:

When reporting a speech the pronoun should be changed according to the relationship of the speaker to the person whose speech is being reported. If the spoken words contain a pronoun or determiner in the first or second person, this often changes to a different person in direct speech: The third person remains the same.There is also used quotation marks in direct speech.

• Salil admitted that he would have told his friend to lend him his car.  (Indirect Speech)
• "I would have told my mother to lend me his car", admitted Salil.(Direct Speech)

In the question : -

He said that his teacher was a nice man .

The direct speech of the above sentence is :

He said , " My teacher is a nice man " .

While converting into direct speech , firstly , his is converted into my according to first pronoun , then was is converted into is and then the objective part a nice man .

Thus , the Correct Option is C , which is He said , " My teacher is a nice man " .