In order to evaluate the effect that the computer has ______ people’s life, they have handed out questionnaires to more than one thousand young citizens, all of ______picked out at random.

In order to evaluate the effect that the computer has ______ people’s life, they have handed out questionnaires to more than one thousand young citizens, all of ______are picked out at random.

 A. on; whom      B. for; them         C. in; whom      D. on; them

 In order to evaluate the effect that the computer has ______ people’s life, they have handed out questionnaires to more than one thousand young citizens, all of whom picked out ______ random.

A. on; with   B. for; at   C. on; at   D. for; with