Ten giant pandas are heading to the Shanghai Expo, _________ they will go on year-long display.

Ten giant pandas are heading to the Shanghai Expo, _________ they will go on year-long display.

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

 Ten giant pandas are heading to the Shanghai Expo, _________ they will go on year-long display.

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

Ten giant pandas are heading to the Shanghai Expo, _________ they will go on year-long display.