She often helps the students _____ she thinks are not good at English.

A. whom              B. which        C. who                   D. when

She often helps the students ________ she thinks are not good at English.

A. whom              B. which                C. who                  D. when

She often helps the students _____ she thinks are not good at English.

A. whom　　　　 B. which　　　 C. who　　　　 D. when