The graph given below represents the effect of sewage discharge on some important characteristics of river.
Select the correct option with respect to the peaks A and B.
A. Peak A- Sharp increase in BOD, disappearance of clean water organisms
Peak B- Increase in dissolved oxygen, reappearance of clean water organisms
B. Peak A- Increase in dissolved oxygen, reappearance of cleanwater organisms
Peak B- Sharp increase in BOD, appearance of clean water organisms
C. Peak A- Sharp increase in BOD, appearance of clean water organisms
Peak B- Increased number in dissolved oxygen, disappearance of clean water organisms
D. Peak A- Increased number of anaerobic bacteria, disappearance of clean water organisms
Peak B- Sharp decline in dissolved `O_(2)`, reappearance of clean water organisms
