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# Fish die in water bodies polluted by sewage due to

$\begin{array}{1 1}(a)\;\text{Pathogens}&(b)\;\text{Foul smell}\\(c)\;\text{Decrease in DO below 4ppm}&(d)\;\text{Clogging of gills by silt}\end{array}$

Fish die in water bodies polluted by sewage due to decrease in DO below 4ppm
Hence (c) is the correct answer.