Over the last three years, the city of Las Vegas has grown in population at a rate of six percent per year. Over the same period of time, however, water usage inside the city of Las Vegas is down almost fifteen percent.

Each of the following, if true, could help to explain the simultaneous decline in water usage and increase in population in Las Vegas, EXCEPT:

A)Due to drought awareness campaigns, the average citizen in Las Vegas now uses almost thirty percent less water now than he or she did three years ago.

B)Two years ago, the city instituted a popular new incentive program for citizens to tear out high water consuming lawns and replace them with low water consuming desert landscaping.

C)The city council has proposed a moratorium on the construction of high water consuming golf courses starting in two years.

D)Three years ago a mining company that consumed vast amounts of water operated within the city limits; now that company is out of business.

E)The mayor ordered that all of the city's hundreds of fountains be shut off, reducing water use due to evaporation considerably.

I was able to point out the correct option C

But I am confused by the fact that the question is explain type....and the answer to that will always explain both sides of the paradox....no options seems to correct this fact rather only explains one side of the argument.