When they went into the shop and asked to look at the engagement rings,the girl brought out a cheape

题目

When they went into the shop and asked to look at the engagement rings,the girl brought out a cheaper one,_she had arranged with James.
A.the which was what
B.what was that
C.which was what
D.that wasthat
Please tell me why

答案

选C,Which引导非限定从句