Why Is Entrepreneurial Ability Considered a Factor of Production

Why is entrepreneurial ability considered a factor of production?

A) because it is a physical input such as land, labor, and capital
B) because entrepreneurs assume the risk of producing output, an important part of the production process
C) because entrepreneurs work very long hours and demand large profits for the work that they accomplish
D) because it is an input that can be used by itself to produce many goods and services desired by society