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: Do you have any English dictionaries? ,F: Yes, just over there. Only 2 copies are left. ,M: I'd like to see some English textbooks, too. Do you have any? ,F: Yes, they are at a discount.
(A) M: Let's change our books in the classroom. (B) M: I’m sorry, I don’t understand. Could you say it again? (C) M: This library is so good. (D) M: I would like to buy them at this bookstore.

D