一道英语题，急啊！！

Question

()Do you know _____________?
A.how many people are there in the world
B.how many there are people in the world
C.how many people there are in the world
D.how many are there people in the world

请写出答案和解题思路，谢谢！

Answer 1

do you know 是主句。
后面接的是从句。
疑问 how many peole
然后右面用陈述语序。
there are in the world.
选择C

Answer 2

A

Answer 3

选C 疑问句中从句应该用陈述句形式。

Answer 4

选A吧。。
我觉得do you know是插入语，how many people……才是主要的意思。
当句中有插入语时，不改变语序。