Most of ______ we call geniuses are successful only because they have made extraordinary efforts.

A. which                    B. that                       C. whom                  D. what

 Most of             we call geniuses are successful only because they have made extraordinary efforts.

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

 Most of ______ we call geniuses are successful only because they have made extraordinary efforts.

A. which                B. that                  C. whom                    D. what

 Most of ________ geniuses are successful only because they have made extraordinary efforts.

A. what do we call                             B. we call what      

C. we call it                                D. what we call