the answer is A. Nonpoint sources are sources that do not directly effect the water,but rather indirectly effect the water. In other words it takes a bit longer to pollute the water than directly putting something in the water.
Septic related to the harmful bacteria and the contaminated particles that are harmful particles that is injurious to the ecosystem.
As the examples of the septic sources include the pollutant that doesn't have source and thus have the nutrient that stops the growth, the nutrient is a pollutant that is river runoff and occurs form a variety of sources like the agricultural forest and the urban areas and also results from form many diffused form the
An example of the sepic pollutants is tanks, public wells and another contaminated body of water, that have an undesirable amount of bacteria viruses and the other contaminant so if the groundwater, etc.
