The high amount of E. coli in water in the indicator of:
Correct answer: C. Sewage pollution
- A. Hardness of water
- B. Industrial pollution
- C. Sewage pollution
- D. Presence of chlorine in water
Explanation
E. coli is a faecal indicator organism, so its high concentration signals contamination by sewage or other faecal waste. It does not indicate water hardness, chlorine, or specifically industrial pollution.
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