Given the task definition and input, reply with output. 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.

F: Hey Mike, good to have you back. You look exhausted. ,M: Hi, Mary. Yeah. I'm totally beat. I can barely keep my eyes open. ,F: Was it a rough trip? ,M: Well, it was actually pretty productive. But all the flying really got to me. ,F: Oh, jet lag. ,M: Yep. I flew from Beijing to Boston for a meeting and then got on a plane to go to the trade fair in Frankfurt. Then back to Beijing before catching a train back here to Shanghai.
(A) F: So you flew from Shanghai to Frankfurt to attend the trade fair, right? (B) F: When did you go to Frankfurt to attend the trade fair? (C) F: I am really sorry, I did not catch that. Would you slow down, please? (D) F: So you flew from Shanghai to Frankfurt to make a speech, right?
B