If We Observe a Fall in the Equilibrium Price of Good

Multiple Choice

If we observe a fall in the equilibrium price of good A, we know that the demand for A has

A) increased or the supply of A has increased or both.
B) increased or the supply of A has decreased or both.
C) decreased or the supply of A has increased or both.
D) decreased or the supply of A has decreased or both.
E) not changed.