Where to hold the 2012 Olympic Games was a subject ______ the Olympic Committee argued for a long time, and finally they voted for London.

 Where to hold the 2012 Olympic Games was a subject ______ the Olympic Committee argued for a long time, and finally they voted for London.

1. A.
   of which
2. B.
   with which
3. C.
   about which
4. D.
   into which

 Where to hold the 2012 Olympic Games was a subject ______ the Olympic Committee argued for a long time, and finally they voted for London.

  A. of which        B. with which         C. about which       D. into which

 Where to hold the 2012 Olympic Games was a subject ______ the Olympic Committee argued for a long time, and finally they voted for London.