Moe divides his time between studying Physics and studying Economics. His production possibilities curve for his final grade in each class is shown below. If Moe moves from Point A to point C, his grade in Physics will go down by __ his grade in economics.
A.less than the decrease in
B.more than the increase in
C.less than the increase in
D.more than the decrease in
正确答案：less than the increase in
