All Social Systems Face the Problem of Economic Scarcity, and This

All social systems face the problem of economic scarcity, and this problem arises primarily from the fact that:

A) in order to produce more of one good, increasing amounts of other goods must be foregone.
B) every society can produce along its possibilities frontier.
C) human wants are essentially unlimited but the means to satisfy these wants are limited.
D) all resources have alternative uses, and this gives rise to opportunity costs.