Moe Divides His Time Between Studying Physics and Studying Economics

Multiple Choice

Moe divides his time between studying Physics and studying Economics.He has discovered that he can earn grades as shown on this production possibilities curve.
Refer to the figure above.Which of the following is evidence that the low-hanging fruit principle applies to Moe's study habits?

A) Earning the first 65 points in economics has a lower opportunity cost than earning the ten points that moves his score from 90 to 100 in economics.
B) Physics is easier to grasp than economics,so it is the "low-hanging fruit" for Moe.
C) Economics is easier to grasp than physics,so it is the "low-hanging fruit" for Moe.
D) The low-hanging fruit principle applies only to production of goods and services,not to grades.