单项选择题

Woman: Professor Burnes seems to think there's only one way to write a paper, and that's her way!
Man: No kidding She sure wasn't like that last semester.
Question: What can be inferred about Professor Burnes

A.She didn't require any papers last semester.
B.She was more flexible last semester.
C.She grades papers very quickly.
D.She isn't teaching this semester.