Refer to the Following Figure to Answer the Questions That

Multiple Choice

Refer to the following figure to answer the questions that follow.

-You can see that the opportunity cost of moving from point B to point D is different from the opportunity cost of moving from point D to point C because:

A) apples are bigger than blueberries.
B) the slope of the production possibilities frontier (PPF) is different in each of the two segments.
C) they are all efficient points.
D) they are all attainable points.
E) the opportunity cost is constant along the PPF.