Consider this scenario. During the early 2000s, the Midwestern United States experienced a drought, or lack of rainfall.

This ruined large amounts of the corn crop.
Tortillas, which are made from corn, became more expensive to make.
What would tortilla manufacturers have needed to do in order to make the same profit?

increase the price of tortillas
decrease the price of tortillas
decrease the supply of tortillas and keep the price the same
decrease the supply of tortillas and decrease the price