The house was built on hillside,( )was a pleasant,windy valleyA by which B below which C under which D in which

The house was built on hillside,( )was a pleasant,windy valleyA by which B below which C under which D in which
The house was built on hillside,( )was a pleasant,windy valley
A by which B below which C under which D in which

The house was built on hillside,( )was a pleasant,windy valleyA by which B below which C under which D in which
B
这是个定语从句,hillside是做从句的主语,意思是,这个房子建在闪耀,下面是一个美丽的,有风的山谷,所以选B,under指的是正下方,不符合,其他的位置不符,A是在山腰旁边,D是在山腰里面

a

B below which