The correct answer is: D. All of these.
Addition polymerization is a type of polymerization in which monomers are added together to form a polymer without the elimination of any small molecules. The monomers must have at least one double bond or triple bond in order to undergo addition polymerization.
Polystyrene is a synthetic polymer made from the monomer styrene. It is a white, odorless, and non-toxic solid that is commonly used in the manufacture of plastics, foams, and elastomers.
Polypropylene is a synthetic polymer made from the monomer propylene. It is a white, odorless, and non-toxic solid that is commonly used in the manufacture of fibers, films, and sheets.
Polyvinylchloride is a synthetic polymer made from the monomer vinyl chloride. It is a white, odorless, and non-toxic solid that is commonly used in the manufacture of pipes, fittings, and other products.
All of these polymers are produced by addition polymerization.