Select the correct indirect form of the given sentence.

Radha said, “Why didn’t he forward his petition to me?”

Radha enquired why he had not forwarded his petition to her.

The correct indirect form of the given sentence is:

Radha enquired why he had not forwarded his petition to her.

The other options are incorrect because they do not follow these rules:

• Radha enquired why he has not forwarded his petition to her. - This sentence does not change the present tense to the past tense for the auxiliary verb "has."
• Radha enquired why had he not forwarded his petition to her. - This sentence has an unnecessary "had" before the auxiliary verb "not."
• Radha enquired why he had not forward his petition to her. - This sentence does not change the infinitive "to forward" to the past participle "forwarded."