The graph given below represents the effect of sewage discharge of some important characteristics of river

Select the CORRECT option with respect to peaks A and B.

Options

A. Peak A - Sharp increase in BOD , the disappearance of clean water organisms
Peak B - In crease in dissolved oxygen , the reappearance of clean water organisms.
B. Peak A - Increase in dissolved oxygen , the reappearance of clean water organisms.
Peak B - Sharp decline in dissolved oxygen , the disappearance of clean water organisms.
C. Peak A - Sharp increase in BOD , the appearance of clean water organisms.
Peak B - Increases of clean water organisms.
D. Peak A - Increased number of anaerobic bacteria, the disappearance of clean water organisms.
Peak B. Sharp decline in dissolved `O_2` , the reappearance of clean water organisms

Answer

A