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.

F: What are you doing this weekend, Mark? ,M: Well, I wanted to go to the mountains or the forest, but I've got no one to go with. ,F: I'm going to the river Do you want to come with me? ,M: I'd love to, thanks.
(A) F: I'm sorry, I don't understand. Could you say it again? (B) F: Happy you join with up to discover the forest. (C) F: OK. Let's meet at my house Sunday moring and then go to the river. (D) F: I really want to go to river with you. But I have something to do then.
Output:
C