Question

what is the primary source of pollutants found in the water of the mississippi river as it flows into the gulf of mexico/gulf of america?
urban wastewater
agricultural runoff
mining operations
power plants

Explanation:

The Mississippi River basin has extensive agricultural areas. Agricultural runoff, containing fertilizers, pesticides, and soil particles, is a major source of pollutants as the river flows to the Gulf. Urban wastewater, mining, and power plants contribute less primarily here compared to agricultural runoff.

Answer:

B. agricultural runoff