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BOD values of clean water (A) is less than 5 ppm So A < 5 BOD values of polluted water (B is greater than 17 ppm So B > 17

1. A and R are true and (R) is the correct explanation of (A)
2. A and R are true but (R) is not the correct explanation of (A)
3. A is true but R is false
4. A is false but R is true

Correct answer: A is true but R is false

Solution

The statement about clean water having BOD values less than 5 ppm is accurate, but the assertion regarding polluted water having BOD values greater than 17 ppm does not directly explain why clean water has lower BOD values, making R false.

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