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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 ?

(a) SE < S < PE < DE

(b) SE < PE < S < DE

(c) PE < S < SE < DE

(d) S< DE < PE < SE

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