In which one of the following the BOD (Biochemical Oxygen Demand ) of sewage (S), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order ?

1. A. SE < PE < S < DE
2. B. PE < S < SE < DE
3. C. S < DE < PE < SE
4. D. SE < S < PE < DE.

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