Answer:
C. a derived demand.
Step-by-step explanation:
Derived demand is a rise in the demand of a product due to the increase in demand for related or intermediate goods. If two distinct goods or services are used together, a rise in the demand of one will cause the demand for the other to rise. Products or services used together are called complementary goods.
Derived demand is primarily as a result of the usage of a product in the production or consumption of other goods or services. In this case, the demand for workers is solely due to a rise in the demand for cars. Should the demand for vehicles decrease, then the demand for workers will fall.