-As Output Moves from Point a to Point B to Point

Multiple Choice

-As output moves from point a to point b to point c along the PPF in the above figure, the opportunity cost of one more unit of good X

A) rises. The opportunity cost of one more unit of good Y also rises.
B) rises. The opportunity cost of one more unit of good Y falls.
C) falls. The opportunity cost of one more unit of good Y rises.
D) falls. The opportunity cost of one more unit of good Y also falls.