He won't give his hand to us.I think so.(合并为宾语从句)

问题描述:

He won't give his hand to us.I think so.(合并为宾语从句)
答案(1)I don't think he will give his hand to us.
(2)I think he won't give his hand to us.
应该选哪一种,为什么?

[1] think从句的否定句否定think