Detailed Instructions: 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.
Q: M: How much is that in total? ,F: $100, but if you have a membership card I can give you a 20% discount. ,M: Great. This is my membership card.
(A) F: The total price after the discount is $80. (B) F: So you should pay me totally $520. (C) F: I’m sorry, I didn’t catch that. Would you mind speaking more slowly? (D) F: You'll give me $100 in all.
A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
A