Factors of production are

(A) the mathematical calculations firms make in determining their optimal production levels.

(B) social and political conditions that affect production.

(C) the physical relationships between economic inputs and outputs.

(D) inputs into the production process.

Answer: Factors of production are " (D) inputs into the production process."

Explanation:The factors of production or inputs are the goods or services that are used to produce other goods or services. There are four types of production factors: land, labor, capital and technology.

With these companies produce other goods or services.