Which of the following is not prepared by Ziegler-Natta coordination polymerisation?

• A. High density Polyethylene (HDPE)
• B. Ultrahigh molecular weight Polyethylene (UHMWPE)
• C. Ethylene-1-alkenebcopolymer (linear low density polyethylene, LLDPE)
• D. Polyvinyl acetate (PVAc)