F: Tommy, you came 1first in the exam. How did you make it? ,M: Oh, it is still a mystery to me.
(A) F: You have solved such a mystery. You deserve this second place. (B) F: I am really sorry, I did not catch that. Would you slow down, please? (C) F: You must studied very hard to achieve such a high score. (D) F: You won a prize on being second in the competition? Congratulations.
C