单项选择题

Man: Can I borrow your maths textbook I lost mine on the bus.
Woman: You've asked the right person. I happen to have an extra copy.
Question: What does the woman mean

A.She can find the right person to help the man.
B.She can help the man out.
C.She's also in need of a textbook.
D.She picked up the book from the bus floor.