Which of the following is the repeating unit of the polymer formed in the polymerization reaction shown below? 
Definitions:
Trailer Pintle Hook
A type of tow hitch that uses a pivoting arm and hook mechanism to connect a trailer to a towing vehicle.
Welding
Welding is a fabrication process that joins materials, usually metals or thermoplastics, by using high heat to melt the parts together and allowing them to cool, causing fusion.
Ethylene Glycol (EG)
A chemical compound used as the primary base for antifreeze solutions in vehicle cooling systems, noted for its ability to lower the freezing point of water.
Freeze Point
The lowest temperature at which a liquid becomes a solid.
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