Sort out the following into group A (i.e. thermosetting plastics), group B (i.e. thermoplastics), group C (neither thermosetting nor thermoplastics).

I) Teflon II) PET              III) Polyvinyl chloride          IV) Bakelite

V) Melamine - urea resin VI) Phenol - formaldehyde resin

VII) Rubber (natural)       VIII) Polystyrene                  IX) Polypropylene

X) Rubber (Synthetic)      XI) ABS rubber