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Four samples of water A, B, C and D have...

Four samples of water A, B, C and D have the `DO` values 1 mg / litre, 3 mg /litre, 5 mg / litre and 8 mg/litre respectively. The more polluted sample of water is

A

A

B

B

C

C

D

D

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The correct Answer is:
A
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