Answer :
The most appropriate answer is b. it is easily polluted or depleted before it can be replaced. Rivers, lakes, groundwater ad rainfall are major sources of fresh water. Environmentalists consider it to be non-renewable because of the high levels of pollution that can be found in the environment today. Pollution renders water useless for domestic purposes. The other reason is due to the fact that in some areas water is used up faster than it can be replaced. This occurs in ares where overpopulation is an issue.
b. water is easily polluted or depleted before it can be replaced