In which one of the following the biochemical oxygen demand (BOD) of sewage (S), distillery effluent (DE), paper mill effluent(PE) and sugar mill effluent (SE) have been arranged in ascending order.

Options

A. SE `lt` S `lt` PE `lt` DE
B. SE `lt` PE `lt` S `lt` DE
C. PE `lt` S `lt` SE `lt` DE
D. S `lt` DE `lt` PE `lt` SE

Answer

C

Explanation

Distillery effluent releases large amount of organic wastes into water, as a result BOD of water is high. Sugar mill effluent releases lesser waste material to the water and paper mill effluent releases least amount of organic waste material into water. So, the order of BOD is PE`lt`S`lt`SE`lt`DE.