Any resources that are made by humans and used to create other goods and services are called

a. services.

c. capital.

b. production.

d. labor.

Let's take an example of such a resource: a saw. A saw is produced by humans and it's used to produce other goods: it's used to cut wood, and after that, furniture can be made of this wood.

A saw can be neither service, nor labor or production - so we reject those answer. The correct answer is c. capital!