In 2012, the equilibrium price of a pizza at Saint Vincent College was $11 and the equilibrium quantity of pizzas per month was 800. In 2013, the equilibrium price decreased to $9 and the equilibrium quantity has increased to 1200. Which of the following could explain this change in the market for pizza? The
A. demand for pizza has increased.
B. demand for pizza has decreased.
C. supply of pizza has increased.
D. supply of pizza has decreased.
Answer: C