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: Hello, this is Tom speaking. Is this Mrs. Green? ,F: Yes. Hello, Tom. We haven't seen each other since your graduation. I often think of you and your former classmates. You were one of my favourites students. How are you getting along at college?
(A) M: I’m sorry, I don’t understand. Could you say it again? (B) M: Mrs.Gordon. I am so happy to be your student. (C) M: Although I see you everyday, I don't wanna buy your goods. (D) M: You were also one of my favorite teachers.

D