Which of the Following Is a Feature Affecting the Public

Which of the following is a feature affecting the public water supply?

A) Surface water is derived primarily from underground aquifers
B) Contaminants break down more slowly in groundwater than in surface water
C) Groundwater sources are most susceptible to contamination by runoff of pesticides and wastes from highways
D) Contaminants such as gasoline from leaking underground storage tanks are likely to primarily affect the quality of surface water