The United States has large water supplies in most of its states. At the same time, the US has the largest system of fresh water lakes in the world The Great Lakes and they alone provide about 6 quadrillion gallons of water. The Mississippi River is another big water provider.
The correct answer will be B) power generation. It takes tremendous amounts of water to provide the power the country needs to function. Also, we must not forget that Irrigation in agriculture is the second consumer of water in the US. Furthermore, public water consumption is high on the list as every home uses an average of 88 gallons of water everyday.
Nevertheless; these water sources are not infinite, and we together most come up with water conservation plans, to ensure that this vital resource will be available for generations to come.