Given a normal market demand curve for unleaded gasoline, if the price of shipping a gallon of gasoline rises from $.50 per gallon to $.75 per gallon, then there is a/an

a. increase in demand for unleaded gasoline.

b. increase in quantity demanded of unleaded gasoline.

c. decrease in demand for unleaded gasoline.

d. decrease in quantity demanded of unleaded gasoline.

e. increase in supply of gasoline.