Answer:
d. Generates a change in quantity demanded.
Explanation:
Because in this case only the price is changing and all other factors are held constant the demand curve will not move and any movement that will take place will be along the demand curve. If the price increases the quantity demanded will decrease and if the price decreases the quantity demanded will increase, the reason for this is that the demand curve is downward sloping, therefore a price change will only change the quantity demanded.