Reason(R): High biological oxygen demand means high activity of bacteria in water.
A. Both (A. and R are correct and (R) is the correct explanation of (A)
B. Both (A) and R are correct and (R) is not the correct explanation of (A)
C. Both (A) and R are not correct
D. (A) is correct but( R) is not correct
Answer:D
Reason(R): High biological oxygen demand means high activity of bacteria in water.
A. Both (A. and R are correct and (R) is the correct explanation of (A) B. Both (A) and R are correct and (R) is not the correct explanation of (A) C. Both (A) and R are not correct D. (A) is correct but( R) is not correct