Answer:
a. reduce their quantity demanded more in the long run than in the short run.
Step-by-step explanation:
When consumers face rising gasoline prices, in the short run the quantity demanded doesn't change because they can't reduce the quantity as they won't have a substitute product because this will require, for example, changes in the vehicle to use a different fuel. However, in the long run the quantity demanded can be reduced because consumers can use substitutes, for example, by adapting the car to use a different fuel or by buying an electric car.