A large number of students give messages to their close friends through this radio club, __________ hosts are all their schoolmates.

A. that                 B. of which             C. which                D. whose

A large number of students give messages to their close friends through this radio club, __________ hosts are all their schoolmates.

1. A.
   that
2. B.
   of which
3. C.
   which
4. D.
   whose