Answer:
D. choice in the face of limited resources.
Step-by-step explanation:
Economic question always deal with the choice in the face of limited resources, since resources are limited and humans needs are unlimited. Resources are always limited, and economics deals with the choice to administrate the resources the best way possible.
When a person decides to assign a resource to a specific use, he is discarding its use for another purpose. This is known as the opportunity cost.