Which of the following is not an example of derived demand?单项选择题

A

a. An increase in demand for toys results in an increase in demand for plastic.

B

b. A decrease in the price of iPads causes an increase in the quantity of iPads demanded.

C

c. A decrease in demand for motorbikes results in a decrease in demand for motorbike tyres.

D

d. An increase in the demand for houses results in an increase in demand for house roof tiles.

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