Which of the Following Would Be the Most Likely Result

Which of the following would be the most likely result of a binding price ceiling imposed on the market for rental cars?

A) frequent rental programs such as "Rent nine times and the tenth rental is free!"
B) enhanced maintenance programs to promote the high quality of the cars
C) free gasoline given to people as an incentive to a rent a car
D) slow replacement of old rental cars with newer ones