A、$7. B、$8. C、$23. D、$15. A一本书需要15美元．但是男士只有8美元，所以他需要从女士那里借7美元。

M: The book costs $ 15, but I only have $ 8. Could you help me?
W: No problem.
Q: How much does the man need to borrow from the woman?