If E Were the Old Equilibrium in the Wheat Market

Multiple Choice

If E were the old equilibrium in the wheat market depicted in the figure below and E' were the new one, which of the following might have caused the change?

A) Good weather caused a supply shift.
B) Good weather caused a demand shift.
C) Bad weather caused a supply shift.
D) Bad weather caused a demand shift.
E) Consumer incomes changed, causing a supply shift.