Which of the following is a classic example of a point source?

• A. Runoff from croplands and logged forests
• B. Pollution from broad, diffuse areas
• C. Factories, oil wells, and animal feedlots
• D. Pollutants from Rainfall

Answer: (C)

Point sources are localized, identifiable discharge points into a water body, such as a pipe, outlet, or specific facility where wastewater is released. This makes factories, oil wells, and animal feedlots the best example, because the pollution can be traced back to a single location where the discharge occurs.

Nonpoint sources are diffuse and come from many places rather than one outlet. Runoff from croplands and logged forests spreads pollutants over large areas and enters water bodies from numerous pathways, not from a single discharge point. Rainfall itself isn’t a single source of pollution; pollutants it carries come from various upstream sources and are delivered to water bodies through widespread runoff, reinforcing the nonpoint nature.