The correct option is C Industrial wastes Industrial effluents are the major water pollutants because of their ingredients. Heavy metal waste like mercury, cadmium, dirt and gravel, masonry and concrete, scrap metal, trash, oil, solvents and chemicals etc. are present in the industrial effluents. Their treatment is a long and expensive procedure as compared to domestic sewage treatment. The industrial waste is corrosive, reactive and igniting. It poses dangerous effects on the aquatic life primarily and human health thereafter. These have shown the biomagnification capability as well.
Hence, the correct answer is 'Industrial wastes'.
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