单选题 M: How about joining me for a cup of coffee?
W: I'd love to, but I'm exhausted. I was up till 3 this morning, writing a paper for my literature class.
Q: Why does the woman decline the man's invitation?
A. She wants to get some sleep.
B. She needs time to write a paper.
C. She has a literature class to attend.
D. She is troubled by her sleep problem.