A water body has high BOD indicating that water is

Receiving minerals

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Being aerated

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Being contaminated with sewage

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Atrophic

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Solution

The correct option is C Being contaminated with sewage
Effect on BOD by sewage

Sewage is a rich source of organic matter.

Contamination of water with untreated sewage will increase the BOD.

Final answer

(a) Being contaminated with sewage

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