Concept:Composite demand occurs when a single commodity is demanded for several different uses.
Explanation:Crude oil is used to produce petrol, kerosene, plastics, lubricants, and many other products.
The overall demand for crude oil is the sum of the demand from all these varied uses.
Because one good is wanted for multiple purposes, this is an example of composite demand.
It is not derived demand, since crude oil is consumed directly in refining processes.
It is not competitive demand, because the uses do not compete against each other as alternatives.
It is not complementary demand, because crude oil is not demanded jointly with another specific good.
Answer:C. composite demand.