must I tell her the truth? ( ). She needs to know it A,yes,you need. B,yes ,you must

must I tell her the truth? ( ). She needs to know it A,yes,you need. B,yes ,you must

B
我必须告诉她真相吗?
是的,你必须这样,她需要知道.

A，must的疑问句中，不能用must回答，应该改为need