Scientists Find That Eating Corn Three Times a Day Will

Scientists find that eating corn three times a day will prolong life. This leads to a shift in preferences away from wheat and toward corn. As we move from one equilibrium to another, we can predict that

A) all input markets are affected.
B) all input markets except land are affected because both products use land as an input.
C) labor markets are not affected because the wheat industry and the corn industry use laborers to drive tractors.
D) even if they use different technologies, no input markets are affected because they use the same inputs.