The correct option is C Manufacturing of soaps and detergents
Uses of Chlorine:
(a) To manufacture Polyvinyl Chloride (PVC).
(b) To disinfect water as it is a highly efficient disinfectant and kills disease-causing pathogens, such as bacteria, viruses, and protozoans.
(c) To manufacture pesticides such as DDT.
But chlorine is not used to manufacture soap and detergents.