The correct option is A Nylon-6,6
Nylon 6,6 is a condensation polymer of adipic acid and hexamethylenediamine.
Teflon is an addition polymer of tetrafluoroethylene.
Neoprene is an addition polymer of chloroprene.
Buna-S is copolymer obtained by addition polymerisation of 1,3-butadiene and styrene.