The Scarcity Principle Tells Us That __________, and the Cost-Benefit

The scarcity principle tells us that __________, and the cost-benefit principle tells us __________.

A) choices must be made; how to make the choices
B) choices must be made; that the costs can never outweigh the benefits of the choices
C) rare goods are expensive; that the costs should outweigh the benefits of the choices
D) rare goods are expensive; that the costs can never outweigh the benefits of the choices