Concept:The demand for labour is not for its own sake but for the goods and services it helps produce.Explanation:Labour is hired by firms to create output that consumers want.So, the demand for labour depends on the demand for the final product.This relationship makes the demand for labour a derived demand.When the demand for goods rises, firms demand more labour.Also, the labour demand curve slopes downward because higher wages reduce the quantity of labour demanded.Answer:A. Derived demand