The correct answer is: C. He asked them whether they would listen to such a man.
The sentence “Will you listen to such a man?” is in the interrogative form. This means that it is a question. The speaker is asking the listener whether they will listen to such a man.
The other options are incorrect because they do not accurately reflect the meaning of the sentence. Option A, “He asked them will you listen to such a man,” is incorrect because it does not include the word “whether.” Option B, “He asked them are you listening to such a man,” is incorrect because it is in the present tense, while the original sentence is in the future tense. Option D, “He asked them whether they will listen to such a man,” is incorrect because it does not include the word “would.”
The word “would” is used to express a hypothetical or tentative situation. In this case, the speaker is asking the listener whether they would listen to such a man in a hypothetical situation.