“________ my pencil case?”

“It's under the chair.”

1. A.
   What's
2. B.
   How
3. C.
   Where's
4. D.
   There

“________ my pencil case?”

“It's under the chair.”

[　　]

---- _______ is my pencil case?

---- It’s on the desk.

A. What    B. How     C. Who       D. Where