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# COD is measure of

$\begin{array}{1 1}(a)\;\text{Organic substance in water}\\(b)\;\text{Oxides of S,P and N in air}\\(c)\;\text{Inorganic pollutants in water}\\(d)\;\text{Salinity of water}\end{array}$

COD is measure of Salinity of water
Hence (d) is the correct answer.