If that is not yours,( )?

题目

If that is not yours,( )?
A、who can it be B、whose can it be
C、who it can be D、it can be whose

答案

应该是选 B、whose can it be 吧
句意就是 如果这个不是属于你的,那它是谁的呢?
把那问句还原就是：it can be sb's 这是某人的
那问句就是 把疑问词whose提前 whose can it be