In a polymer recycling plant, polymer " $\mathbf{X}$ " was depolymerized by glycolysis in the presence of ethylene glycol and a suitable catalyst. The glycolysis reaction yielded the following compound:
Identify the polymer " $\mathbf{X}$ " from the following options.
- Poly(ethylene terephthalate)
- Polystyrene
- Acrylonitrile butadiene styrene
- Poly(vinyl chloride)
