Concept:The central economic problem is scarcity, which makes it necessary to decide how to use limited resources.Explanation:Every society has unlimited wants but limited resources.This creates the basic problem of scarcity.Since resources cannot satisfy all wants, society must choose what to produce, how to produce, and for whom to produce.This is known as resource allocation.The other options are not fundamental economic problems; they are specific issues that may affect an economy.Answer:D. resource allocation