A) Hardness of water
B) Industrial pollution
C) Sewage pollution
D) Presence of chlorine in water
Correct Answer: C
Solution :[c] The high amount of E. coli in water, is the indicator of sewage pollution. Due to this, when there is a greater number of microbes like E. coli in water, they consume most of the oxygen. It ultimately leads to oxygen deficiency in water.
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