请教一道英语词组辨析题~

题目

请教一道英语词组辨析题~
Those who are ____the plan,please put up your hands.
A.in support of B.in favor of C.in honour of D.in terms of
我想知道A与B应该怎么排除或分辨.好像都是支持的意思啊?
请解释具体点A与B的区别啦

答案

The key is B.这是固定的用法 be in favour of sth./ in support of sth.In support of sth使用时前面不带be动词,而be in favour of sth.带