F: Are you OK, Chuck? You look pale. ,M: I'm fine, Catherine. I just stayed up late last night working on my Chinese.
(A) F: Really? You mean you look pale because you stayed up late? Okay, I see. (B) F: Really? You are not fine and you look pale because you are ill? (C) F: So, you mean you look pale because you stayed up late to work on your English? Okay, I see. (D) F: Just a minute! I do not quite follow what you are saying, would you mind repeating that?
A