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Who is the man that spoke to you just now?

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Who is the man that spoke to you just now?
--If you ____ must know,he is Clare,one of my sister's friends.
A.have to
B.must
C.need
D.would
Must i take a bus?
--No,you ___.You can walk there.
A.must not
B.don't
C.don't have to
D.had better not to
Please explain
1.B 这个must不是表示推断,If you must know算是一种常用的说法,意思是:如果你一定要知道的话.
2.C 用must提问,回答一定不能用mustn't ,也不用D这种说法回答,要用needn't 或don't have to.