Given the task definition and input, reply with output. In this task you are given a small conversation between two persons and 4 options on how the conversation should continue. Your job is to choose the most reasonable option. The conversation and the options are separated by a newline character. Each dialogue in the conversation are separated by a comma. F and M indicate female and male, respectively.

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