M: Excuse me, where can I find the reference books? ,F: They're on the third floor.
(A) M: OK. I will find the reference books on the 4th floor. (B) M: I am sorry. You spoke so rapidly that I did not catch the meaning of what you said. Could you repeat that? (C) M: On the 1st floor? That would be convenient. (D) M: I'll go to the 3rd floor to get the reference book. Thanks.
D