A) Acid rain
B) Nitrates and phosphates
C) Sulphates and carbonates
D)
and 
Correct Answer: B
Solution :
Due to addition of domestic sewage, phosphates, nitrates etc. in water body, the water body become rich in nutrients especially phosphates and nitrates ions, as a result of nutrient enrichment water bodies become highly productive or eutrophic and this phenomena is called eutrophication.
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