Living in the central Australian desert has its problems,______ obtaining water is not the least.

A. for which       B. to which      C.of which     D. in which

 Living in the central Australian desert has its problems,______ obtaining water is not the least.
   A. for which             B. to which           C.of which        D. in which

 Living in the central Australian desert has its problems,______ obtaining water is not the least.

   A. for which             B. to which           C.of which        D. in which

Living in the central Australian desert has its problems,______ obtaining water is not the least.

1. A.
   for which
2. B.
   to which
3. C.
   of which
4. D.
   in which

Living in the central Australian desert has its problems, _____ obtaining water is not the least.

A. of which       B. for what              C. as               D. whose