The influx of domestic sewage containing detergents cause nutrient enrichment in water bodies due to the presence of

Answer: Option C

The influx of domestic sewage containing detergents cause nutrient enrichment in water bodies due to the presence of phosphates. Sewage, sludges, and effluents contain appreciable amounts of phosphates, which become a decisive factor in excessive growth of algae and other forms of life when these wastes are discharged into waterways. The presence of phosphates in a body of water indicates its pollution with sewage or other organic wastes. After proper treatment these wastes may be applied to soil and the phosphates thus used to improve crop growth.