单项选择题
M: Er, excuse me, Professor Muse.
W: Oh, yes, Arnold, come in.
M: You asked to see me after class.
W: Yes, I did, Arnold. I just wanted to have a few words with you about your performance in class lately. Your last three test scores have been very disappointing.
M: I know I’ve let you down. I have been studying much harder this semester.
W: Well, I’m glad you’ve realized it, Arnold, because if you don’t improve, you will not be able to get a B or above for the final exam.
A．His scores in recent tests.
B．The difficulties he has with his studies.
C．His poor academic performance.