Use the Following Scenario to Answer the Following Questions

Use the following scenario to answer the following questions:
Rosa and Dirk produce basketballs and footballs.Rosa can produce six basketballs per hour or two footballs per hour.Dirk can produce three basketballs per hour or four footballs per hour.
-Based on the scenario,Rosa's opportunity cost of one football is ________ basketballs.

A) four
B) one and a half
C) six
D) three
E) eight