单项选择题

M:There will be a party of our old classmates this Saturday.Can you come
W:I’d love to, but I have to work at a book store at weekends.

What is the woman going to do this Saturday()

A. Go to a book store to buy books.
B. Go to the classmates’ party.
C. Go to work in a book store.
D. Do her work at home.