Concept:A production possibility curve (PPC) shows the maximum combinations of two goods an economy can produce with its available resources and technology.
Explanation:The PPC is used to illustrate scarcity, choice, and opportunity cost.
A point on the curve indicates efficiency, while a point inside the curve indicates inefficiency in the use of resources and unemployment of labour.
Thus, scarcity of resources, inefficiency, and unemployment of labour are all concepts emphasised by the PPC.
Economic development, however, is not directly shown by a single PPC; it is represented by an outward shift of the curve over time.
Answer:B. Economic development