The revolutionary system of farming, said the Israeli government spokesman, was one_____ he believed could change the face of modern agriculture.

1. A.
   that
2. B.
   how
3. C.
   /
4. D.
   what

 The revolutionary system of farming, said the Israeli government spokesman, was one_____ he believed could change the face of modern agriculture.

A. that                        B. how                       C. /               D. what