Pollutants discharged at specific locations.

• A. Nonpoint sources
• B. Point sources of water pollution
• C. Industrial Waste
• D. Agricultural Runoff

Answer: (B)

The main idea here is distinguishing point sources from nonpoint sources. Pollutants discharged at specific locations describe a discharge from a single, identifiable outlet—such as a pipe, ditch, or wastewater treatment plant outfall. That definite location is what defines a point source of water pollution, making it the best fit for the description.

In contrast, nonpoint sources involve inputs from many places across a watershed, typically carried by rainfall or irrigation runoff, with no single discharge point. Agricultural runoff is a classic example of a nonpoint source. Industrial waste, while it can involve point-source discharges, isn’t the concept being described by the phrase about location; it’s about the type of pollutant or activity rather than the single-location discharge idea.