Which situation best illustrates the concept of scarcity?

a class designing and selling calendars
a cook learning to be an executive chef
a friend buying a copy of a popular DVD
a person buying a used car due to limited income

a person buying a used car due to limited income

The situation that best illustrates the concept of scarcity is: a person buying a used car due to limited income. Scarcity refers to the limited availability of resources or goods in relation to unlimited wants or needs. In this case, the limited income of the person restricts their ability to purchase a new car, which may have more desirable features or condition.