Answer:
The correct answer is the first option: To impose a minimun price per gallon of tap water consumed that is five cents greater thant the actual price.
Explanation:
To begin with, if the local government is looking forward to reduce the consumption of the tap water due to the decrease in the level of water in the lakes of Chapel Hill, then it must impose a minimum price per gallon of tap water consumed that is five cents greater than the actual price due to the fact that when the citizens continue to consume the tap water they will have to pay 5 cents more every time the exceed the gallon of water consumed, therefore paying more than one time the 5 cents extra in the consumption instead of paying just one single time the 5 cents due to the simple consumption of water as it is suggested in the other option.
To sum up, if the government charges 5 cents more every gallon of water then the people will decrease their consumption because everytime they passed the gallon of water then they will have to pay another extra 5 cents and so on.