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[A] : Population density of indicator or...

[A] : Population density of indicator organisms show degree of water pollution .
[R] : BOD is an index of organic waste in 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 but R is false.

D

If both A and R are false.

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