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

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Nonpoint source pollution comes from many diffuse locations across a landscape, not from a single, identifiable discharge. Agricultural runoff fits this because rain or irrigation water washes nutrients, pesticides, and sediments from widely distributed fields into nearby streams and rivers—there isn’t one pipe to point to. In contrast, a factory discharge pipe and a wastewater treatment plant outflow are point sources, releasing pollutants from specific, discrete locations. An unregulated air emission isn’t a direct, typical water pollution source, though it can contribute indirectly through atmospheric deposition; it doesn’t illustrate the classic diffuse, landscape-wide runoff that defines nonpoint sources.