M: How much is the entrance fee to you know zoo? ,F: The fee is $30. ,M: Is that for adults or children? ,F: That's for adults. The price for students is $20, then for children under 12 it's free.
(A) M: I am afraid I did not quite catch what you were saying. Please repeat it. (B) M: $20 for students is quite reasonable, do I need to show my student ID? (C) M: So my 10-year-old son needs to pay $20. (D) M: $12 for adults is a good price.
B