Moe divides his time between studying Physics and studying Economics. His production possibilities curve for his final grade in each class is shown below. Which of the following is true?

A.Moe’s opportunity cost of studying for each subject is increasing.

B.Moe has an absolute advantage in economics.

C.Moe has a comparative advantage in physics.

D.Moe has a comparative advantage in economics.

正确答案：Moe’s opportunity cost of studying for each subject is increasing.