Advertising is distinguished from other forms of communication__ the advertiser pays for the message

题目

Advertising is distinguished from other forms of communication__ the advertiser pays for the message to be delivered.
A.in that
B.which
c.where
D.in which
为什么?
请详细说明,分析每个选项,

答案

in that在这里表示原因,原句的意思是广告区别于其他通讯方式的原因是广告主付钱使消息（指广告）传播
that在这里引导一个宾语从句
其他选项都不能引导宾语从句,B和D引导定语从句,而C引导状语从句