------ The authors of computer viruses are geniuses.

------ I agree. They can apply their wisdom to other net technology ________ human beings can benefit.

--- The authors of computer viruses are geniuses.
--- I agree. They can apply their wisdom to other net technology ________ human beings can benefit

1. A.
   in which
2. B.
   through which
3. C.
   on which
4. D.
   from which

------ The authors of computer viruses are geniuses.

 ------ I agree. They can apply their wisdom to other net technology ________ human beings can benefit.

A. in which    B. through which    C. on which    D. from which

―The authors of computer viruses are geniuses.

―I agree. They can apply their wisdom to other net technology       human beings can benefit.

       A. in which                B. through which        C. on which               D. from which

---The authors of computer viruses are geniuses.

---I agree. They can apply their wisdom to other net technology from　　 human beings can benefit.

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

------ The authors of computer viruses are geniuses.
------ I agree. They can apply their wisdom to other net technology ________ human beings can benefit.