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(C) $BOD$ (Biochemical Oxygen Demand) is a measure of the amount of dissolved oxygen required by bacteria to decompose organic matter present in a wat

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$3$

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(C) $BOD$ (Biochemical Oxygen Demand) is a measure of the amount of dissolved oxygen required by bacteria to decompose organic matter present in a water sample. Clean water typically has a $BOD$ value of less than $5 \ ppm$,while highly polluted water has a $BOD$ value of $17 \ ppm$ or more. Therefore,among the given options,$3 \ ppm$ represents the cleanest water sample.

$A$ water sample is considered the cleanest based on which of the following $BOD$ values (in $ppm$)?

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