F: What do you think of yesterday's lecture? ,M: The topic was interesting, but the lecture was much more difficult to follow than I had expected.
(A) F: I agree with you the presentation it's interesting and easy to take notes. (B) F: I am sorry. You spoke so rapidly that I did not catch the meaning of what you said. Could you repeat that? (C) F: The lecture was too difficult for you. No wonder you thought it was boring. (D) F: You told me how difficult the lecture could be, and you were so right.
B