B
一个问句中只能提前一个主动词.所以不能选C.
在特殊疑问句中如果有插入语you think ,那么提前you think的主动词do,剩下的是陈述语序.
不一定是what do you think ...
是：wh-疑问词 + do you think + 陈述语序.
如：
who do you think will be our monitor?
where do you think he came from?
which do you think he likes?
why do you think he told a lie?
whom do you think he will give the gift to?
How do you think he solved the problem?