You will be given a definition of a task first, then some input of the task.
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.

M: I have to go to Professor Hudson's office to discuss my thesis. If time allows I'd like to go to the movies with you when I come back. ,F: I don't think I can make it. I'm going shopping with Jane right now.
(A) M: It's a pity. You know I must go to watch a movie first. (B) M: It's a pity. You know I must go to meet my teacher first. (C) M: It's a pity. You know I must go to do some shopping first. (D) M: I am really sorry, I did not catch that. Would you slow down, please?
Output:
B