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Assertion (A) : The lower the concentrat...

Assertion (A) : The lower the concentration of `DO`, the the more polluted is the water sample.
Reason (R) : Oxygen is consumed by microbes for the decomposition of organic matter present in water.

A

Both A and R are true and R is the correct explanation of A.

B

Both A and R are true but R is not correct explanation of A.

C

A is true and R is false

D

A is false and R is true.

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