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: Ah, that's the forth ad that appears suddenly on my computer screen since I started working on my paper. ,F: You can buy an app that will stop those ads. ,M: I can't afford to buy some fancy $10 software just so I can write my paper. ,F: It's not that expensive. It's $1 per month.
(A) M: I agree with you. It is not expensive if the app cost $1 monthly. (B) M: I'm sorry, I don't understand. Could you say it again? (C) M: It is really expensive to buy an app on my phone which cost $12 monthly. (D) M: I have finished my paper, so I don't need to buy the app which need $30 monthly.
Output:
A