The demand for a resource depends primarily on:

A) the supply of that resource.
B) the demand for the product or service that it helps produce.
C) the price of that input.
D) the elasticity of supply of substitute inputs.

The demand for a resource is primarily derived from the demand for the product or service that it helps produce. The more demand there is for a product or service, the more demand there will be for the resources needed to produce it. The supply of the resource, the price of the input, and the elasticity of supply of substitute inputs can all affect the demand for the resource, but they are secondary factors.