单项选择题

W: It’s ten o’clock. I’m going to have to be leaving.
M: Leaving Already
W: Yes. I’ve got to get up early tomorrow morning.
M: OK. Stop over again sometime.
W: Sure. Thank you very much for your dinner. See you then.
M: See you then.

Why did the woman have to be leaving()

A. Because she had to go home.
B. Because she had to get up early tomorrow morning.
C. Because she had tired.