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# Non- biodegradable nature of detergent is

$(a)\;\text{Presence of salts} \\ (b)\;\text{Presence of sulphate group} \\(c)\;\text{Presence of -OH group} \\ (d)\;\text{Presence of branching}$

The main reason for the non-biodegradable nature of the detergent is the presence of branching in the acid group on its sodium salt.
These chains break with difficultly by the microganisms that are present in sewage discharge, septic tanks, making detergents non-biodegradable.
Hence d is the correct answer.