Solutions
The given sentence is in Direct Speech because it quotes actual words. Therefore, it must be changed into Indirect Speech.
We notice that the reporting verb is in the Past tense (‘asked'). Hence, a change will be made in the tense of the reported speech.
Also, the first person of the reported speech is changed according to the subject of reporting speech.
The past tense (had) is changed to past perfect tense (had wanted).
The pronoun 'you' is changed to 'him' and 'your' is changed to 'his'.
'Will' is changed to 'would' and 'now' is changed to 'then'.
The second part of the sentence is a question. Therefore, 'do' will be changed to 'if' and 'you' is changed to 'I'.
Therefore, the sentence in Indirect Speech will be "They had wanted to know who then would listen to his story and provide him with the solution".
Hence, option C is the correct answer.