Assume That the Salinity Problem in Australia Becomes Worse and a Large

Assume that the salinity problem in Australia becomes worse and a large proportion of land can no longer be used for agricultural purposes. The likely effect on the supply of wheat can be illustrated by:

A) a shift rightwards of the supply curve of wheat
B) a movement down along the supply curve of wheat
C) a shift leftwards of the supply curve of wheat
D) a movement up along the supply curve of wheat