单项选择题

Speaker A: Excuse me, Prof. Davidson. But I was hoping to talk to you about my class project for economics.
Speaker B: ______. Why don’t you come and see me during office hours tomorrow

A. I have a call to make in a moment
B. I have to finish my paper in a few days
C. I have a class in a few minutes
D. I have to hurry up to finish my meal