One type of pollutant that was dumped into Lake Washington was raw sewage that contained human wastes. How would a sewage treatment plant
have been able to solve the lake's pollution problem?
A. Turn the raw sewage into pure water,
B. Remove the organic materials from the sewage,
C. Transfer the raw sewage to a larger body of water,
D. Dilute the raw sewage with water,

The correct option is;

B. Remove the organic materials from the sewage

Explanation:

In water treatment plants, floating the and settling solid wastes (by gravity) materials are removed and further process of sedimentation, screening grit removal are performed, to segregate and remove form solid wastes. Sedimentation tanks known as primary clarifiers are used to remove suspended solid wastes.

The soluble organic materials that pass through primary treatment are removed in the secondary treatment

The reduction and removal of the soluble and insoluble organic matter serves to preserve the amount of oxygen available in the final destination of the treated sewage waste water including a lake or stream.