Is it in Zhou Qu _________ the terrible mudslide happened two months ago, killing more than one thousand people?

A. where   B. when    C. which    D. that

Is it in Zhou Qu _________ the terrible mudslide happened two months ago, killing more than one thousand people?

1. A.
   where
2. B.
   when
3. C.
   which
4. D.
   that

Is it in Zhou Qu _________ the terrible mudslide happened two months ago, killing more than one thousand people?

A. where   B. when    C. which    D. that

Is it in Zhou Qu _________ the terrible mudslide happened two months ago, killing more than one thousand people?