Who is that girl ___ was there?

Question

Who is that girl _____ was there?
A、whom B、that C、which D、whose 我不明白这道题的后面部分为什么用过去式？

Answer 1

选C吧，感觉怪怪的~~~比如说主人公正指着一张照片问另一个人，相片里的那个女孩是谁？相片里的场景是过去发生的事~~
希望我想象的对，呵呵

Answer 2

C
定语从句。