What Is the Advantage of Removing Phosphates and Nitrates from Wastewater

What is the advantage of removing phosphates and nitrates from wastewater?

A) Nitrates and phosphates can support the growth of algae and cyanobacteria, and these photosynthetic organisms will then produce organic compounds, thereby increasing the BOD of the water.
B) Nitrates and phosphates can support the growth of fish, which then produce increased amount of wastes, thereby increasing the BOD of the water.
C) Nitrates and phosphates inhibit the growth of bacteria that normally purify the water; without them, the BOD of the water rapidly increases.
D) Nitrates are usually removed by denitrifying bacteria that use nitrate during anaerobic respiration to form N2, a gas that is toxic and detrimental to other organisms. Removing nitrates protects these organsisms.
E) Phosphates are an integral part of prokaryote cytoplasmic membranes. If there are too many phosphates in the water, microbial growth is stimulated, leading to the risk of contamination.