Which basic economic question determines how a society will produce goods and services?
a) who consumes the goods and services?
b) how can available resources be used efficiently?
c) what goods and services are produced?
d) what price should goods and services be sold at?
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B. How can available resources be used efficiently?

Explanation:

In order to maximize the efficiency of the limited productive resources a society needs and wants, we must ask three main questions (what to produce, how  to produce and for who to produce). All economic systems (free-market, mixed, command, and traditional) seek to solve these three questions.

To determine how a society will produce goods and services we must ask how can available resources be used efficiently, which resources are adequate to produce certain good, and how it will be produced, whether it is by machines or people to maximize the capacity of production.