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: M: Excuse me, I'm looking for a textbook by a professor Herrick for the science course. ,F: Let me check. I'm sorry. It's sold out.
(A) M: Could you please check if this textbook is available in other bookstores? (B) M: You can't borrow books from us. We're a bookstore, not a library. (C) M: Ok, then I'll check out this five books, thank you! (D) M: I’m sorry, I don’t understand. Could you say it again?

A