Which question addresses scarcity in economics?

The question that best addresses scarcity in economics is focused on the wants and constraints of individuals involved. Scarcity refers to the fundamental economic problem of having limited resources to meet unlimited wants and needs. By understanding the wants of people and the constraints they face—such as time, money, or available resources—we can gain insight into how individuals and societies prioritize their needs and make choices. This relationship between limited resources and unlimited desires is at the heart of economic inquiry and decision-making.

The other choices, while related to economic concepts, do not directly emphasize the issue of scarcity in the way that focusing on wants and constraints does. Trade-offs are indeed connected to scarcity, but they don't explicitly define the problem; rather, they refer to the choices made in response to it. Understanding responses from others pertains more to behavioral economics and market reactions rather than the underlying issue of scarcity. Finally, asking why everyone isn't already engaged in a particular activity also shifts the focus away from scarcity to the motivations and barriers faced by individuals. Thus, focusing on wants and constraints effectively illuminates the core concept of scarcity in economics.