Select the correct indirect form of the given sentence.

My niece said, “I have decided to take coaching in badminton.”

My niece told me that she had decided to take coaching in badminton.

The correct indirect form of the given sentence is:

My niece told me that she had decided to take coaching in badminton.

The other options are incorrect:

• My niece told that I have decided to take coaching in badminton. This is incorrect because the pronoun "I" is used to refer to the speaker, but the speaker's niece is talking about herself.
• My niece said she is deciding to take coaching in badminton. This is incorrect because the reported speech is in the present progressive tense, which is used for actions that are happening now.
• My niece said she will decide to take coaching in badminton. This is incorrect because the reported speech is in the future tense, which is not appropriate for a decision that has already been made.