F: Well, I wonder if the drug store is still open. ,M: But it's not yet 9 o'clock. In fact, it's only 8:45.
(A) F: I didn't know the drug store closed at  8:45. (B) F: I’m sorry, I don’t understand. Could you say it again? (C) F: Thank you for telling me that the bookstore closes at 9:00. (D) F: Great, I'll go to the drugstore at 9:15 then.
B