Which of the following is a nonpoint source of water pollution? 

A)  a logged area 
B)  a coal mine 
C)  a sewage treatment plant 
D)  an electric power plant

Nonpoint Source

Pollution originating from diffuse areas rather than identifiable, discrete sources.

Logged Area

A region where trees have been cut down for timber or forestry purposes, often leading to changes in the ecosystem.

Sewage Treatment

The process of removing contaminants from wastewater, primarily from household sewage, to produce an environmentally safe fluid waste stream and a solid waste suitable for disposal or reuse.