M: How many cups do we need? ,F: We have bought 10 online and my mom is just sent 20 over, so we have already got enough.
(A) M: So we have 10 cups now. 2 of them are bought online. (B) M: All right. We just have 20 cups. What about 5 cups that are sent by your mom? (C) M: Excuse me, could you repeat the question? (D) M: You are right. So we have 30 in total. I think it is enough.
D