If the Production Possibilities Curve Is a Straight Line

Multiple Choice

If the production possibilities curve is a straight line:

A) ​opportunity costs increase as output of either commodity is expanded.
B) ​resources are not equally substitutable between the production of the goods.
C) ​opportunity costs are negative.
D) ​as an increasing quantity of resources are shifted from one manufacturing process (good Y) to another (good X) , there is no increase in opportunity cost.