Over the Previous Year, 2,000 Boxes of Antihistamine Tablets Were

Multiple Choice

Over the previous year, 2,000 boxes of antihistamine tablets were sold at a price of $20 per box, and during the current year, 2,500 boxes of tablets were sold at $25 a box.The most likely interpretation of these data is that the

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