问题详情

According to the man, what should one do if a book he has borrowed is recalled？

A．He must return it immediately.

B．He must return it within 7 days of the due date of the book.

C．He must return it within 7 days of the recall notice.

D．He must return it as soon as you can.

请帮忙给出正确答案和分析，谢谢！