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Given below are two statements: One is labelled as
Assertion (A) and the other is labelled as Reason (R)
Assertion (A): Polluted water may have a value of \( \mathrm{BOD} \) of the order of \( 17 \mathrm{ppm} \).
Reason \( (\mathbf{R}) \) : BOD is a measure of oxygen required to oxidise both the biodegradable and non-biodegradable organic material in water.

In the light of the above statements, choose the most appropriate answer from the options given below.
(a) Both \( (\mathrm{A}) \) and \( (\mathrm{R}) \) are correct and \( (\mathrm{R}) \) is the correct explanation of \( (\mathrm{A}) \)
(b) Both (A) and (R) are correct but (R) is not the correct explanation of \( (\mathrm{A}) \)
(c) \( (\mathrm{A}) \) is correct but \( (\mathrm{R}) \) is not correct
(d) (A) is not correct but \( (\mathrm{R}) \) is correct
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