Economics studies choices that arise from one fact. what is that fact?
a. we are running out of clean air and clean waterwe are running out of clean air and clean water.
b. not everyone considers the choices of othersnot everyone considers the choices of others.
c. businesses create too many different brands of most goodsbusinesses create too many different brands of most goods.
d. our resources are unable to satisfy all our wantsour resources are unable to satisfy all our wants.

D) Our resources are unable to satisfy all our wants

Explanation:

Scarcity is the main starting point for all economic studies. It is simple, all resources are scarce, and humans always want more and that need exceeds all the available resources.

Even the largest corporations in the world or the richest people have limited resources, their limits may be extremely large, but nonetheless the limits exist, e.g. Apple has $210.6 billion in cash, but only that amount.

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