About One Hundred Years Ago,cities Began to Address the Problems

About one hundred years ago,cities began to address the problems of sewage disposal by dumping sewage into nearby rivers via storm water drainage systems.One of the results of this strategy was that

A) cities no longer needed to treat drinking water that was drawn from nearby river systems.
B) the quality of the water in the local rivers and streams greatly improved.
C) people living upriver of these cities were more likely to experience contamination of their drinking water sources.
D) people living downriver of these cities were more likely to experience contamination of their drinking water sources.