7. When moving along a production possibilities frontier, the opportunity cost to society of obtaining more of one of the two goods:
A) is measured in dollar terms.
B) usually decreases as more of the good is produced.
C) is measured by the amount of the other good that must be given up.
D) is measured by the additional resources that must be used to produce the good.
E) is usually constant.
Production possibilities frontiers are examined.