Definition: 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.
Input: F: Good afternoon, how can I help you? ,M: I want to borrow some books, but I don't have a card. Can I apply for one? ,F: Sure, please fill out the form.
(A) M: Thanks, I'd like to deposit 5,000 yuan. (B) M: I want to buy all these books, how much are they? (C) M: I'd like to return these five books. (D) M: I am really sorry, I did not catch that. Would you slow down, please?

D