An addition polymer is formed when monomers add together without losing any atoms. This typically involves monomers with carbon-carbon double bonds (like alkenes) undergoing chain-growth polymerization.

Let's analyze the options:

• Teflon (polytetrafluoroethylene) is made from tetrafluoroethylene (CF₂=CF₂), an addition reaction: $n({\mathrm{CF}}_2={\mathrm{CF}}_2)\to ({\mathrm{CF}}_2-{\mathrm{CF}}_2)n_{}$
• Neoprene is made from chloroprene (CH₂=CCl-CH=CH₂), also an addition reaction.
• Polyvinyl chloride (PVC) is made from vinyl chloride (CH₂=CHCl), another addition reaction.

Since all three are formed via addition polymerization, the correct choice is "All of these".

Final Answer: All of these