Answer:
c. 3 apples.
Explanation:
The opportunity cost is the alternative forgone. It is the item on the scale of preference that had to be let off in the fulfillment of other wants.
Given the two points A, at which there are 10 apples and 20 pears, and point B, at which there are 7 apples and 21 pears, moving from point A to B would mean that the number of apples will decrease from 10 to 7 while the number of pears will increase by 1.
As such, the opportunity cost is 3 apples (10 - 7).
