听力原文：F: Hello! This is Prof Gates' office. I'm calling to remind you of your 4:15 appointment with the professor to discuss your term paper tomorrow.
M: Oh, thanks. It's a good thing that you called, I thought it was 4:15 today.
Q: What does the man mean？
(18)

A. He didn't make the appointment with the professor.
B. He totally forgets about the appointment.
C. He would probably go to the professor's office today if the woman didn't call him.
D. He though the appointment was 4:50.