Concept:Economics is mainly concerned with the problem of scarcity and how limited resources are used to satisfy unlimited human wants.
Explanation:Human wants are unlimited, but the resources needed to satisfy them are limited.
These limited resources include land, labour, capital, and entrepreneurship.
Because these resources are not enough to produce everything people want, choices must be made.
This problem of scarcity is the main reason economics is studied.
Unemployment and overpopulation are economic problems, but they arise from the basic condition of scarcity.
Unlimited resources would remove the need for economics altogether.
Therefore, the study of economics is necessary mainly because of scarcity of resources.
Answer:C. Scarcity of resources.