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Assertion : As the amount of dissolved o...

Assertion : As the amount of dissolved oxygen in water decreases, BOD increases.
Reason: Microorganisms involved in biodegradation of organic matter requires a lot of dissolved `O_(2)`.  

A

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

B

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

C

.A. is true but .R. is false.

D

Both .A. and .R. are false.

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The correct Answer is:
A
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