Correct option is D, The demand for a resource is a derived demand if there were no demand for output, there would be no demand for input.
A desire for a good or service that arises from the demand for a separate, or related, good or service is referred to as derived demand in economics. Derived demand only refers to the need for a good or service to be able to purchase or create another good or service.
Demand for a good or service that results from demand for another related good or service is known as derived demand. A case for a new smartphone that has just hit the market that is a particular size and configuration can be an example of derived demand.
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