F: You'd better change your topic. I think you may not really know much about this. ,M: No, I'll try to finish it.
(A) F: I didn’t hear you. Please could you tell me again? (B) F: Why do you want to change your topic? You need to have more confidence. (C) F: Are you sure? I sincerely advise you change your topic. (D) F: You don't need to learn more about the topic. You can write a whole article about this topic with your current knowledge.
C