Answer:
d. decrease in quantity demanded of unleaded gasoline.
Explanation:
Since the shipping cost of a gallon of gasoline is increased from $0.50 per gallon to $0.75 per gallon that reflect the increase in price
As the price is increased, the quantity demanded of unleaded gasoline is decreases as the shipping cost increases which affect the other factors
So, at one time the price increases with the decreases in the quantity demanded