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[A] : An estimation of B.O.D gives an in...

[A] : An estimation of B.O.D gives an indication of the amount of pollution in a body of water .
[R] : B.O.D is measure of the oxygen requirements of the bacteria , which are living in the water .

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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