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: Have you handed in your exercise book, Jack? ,M: I'm sorry, I haven't, Miss Smith. I have already finished the exercise, but I can't find my exercise book anywhere now.
(A) F: You can' t find your exercise book? Why? (B) F: Bob, why don' t you find your exercise book? (C) F: I’m sorry, I didn’t catch that. Would you mind speaking more slowly? (D) F: Joe, you are so careless, how can you leave it on the bus?

A