Last Year, 1,000 Cases of Bottled Water Were Sold at $5;

Last year, 1,000 cases of bottled water were sold at $5; this year, 1,200 cases were sold at $7. These data could be explained by the

A) supply and demand curves shifting to the right.
B) supply and demand curves shifting to the left.
C) supply curve shifting to the left, with no change in demand.
D) demand curve shifting to the right, with no change in supply.