Which reason justifies the implementation of an environmental program to reduce pollution in the following scenario?

Thomas's town has a large agricultural population that uses pesticides to prevent the deterioration of the crops. These pesticides often end up washing into the local river, from which much of the community’s water is gathered. Even though the water flow is rapid, local fish have been mutating, and, despite advanced filtration, people in the area are becoming ill.

Responses

Indirect contamination sources can cause pollution in water supplies.
Indirect contamination sources can cause pollution in water supplies.

No amount of chemical pollutants should be allowed near water supplies.
No amount of chemical pollutants should be allowed near water supplies.

All chemicals should be treated so they do not pollute the environment.
All chemicals should be treated so they do not pollute the environment.

The pollution is being caused by something other than pesticides.