Final answer:
The factor of production that is conserved through the use of physical capital is capital.
Step-by-step explanation:
The factor of production that is conserved through the use of physical capital is D. Capital.
Physical capital refers to the tools, equipment, and machinery necessary for production. By utilizing physical capital, businesses can increase efficiency and productivity, ensuring that capital is conserved and effectively used.
For example, a factory may use automated machines to streamline production processes, reducing the need for manual labor and conserving the use of labor as a factor of production.