Final answer:
Option (c), Labor is the term referring to the human effort used in the production of goods and services. It is one of the essential factors of production, which also includes land, capital, and entrepreneurship.
Step-by-step explanation:
The quantity and quality of human effort directed toward producing goods and services is known as labor. Labor is one of the factors of production which also include land, capital, and entrepreneurship. While entrepreneurs play a key role in organizing these factors of production to create goods and services, specifically, labor refers to the human capital that is applied in the work process.