Poly vinyl chloride (PVC) is the type of:

Explanation

This is the option marked correct in the official UHS answer key. PVC softens on heating and can be remoulded repeatedly because its chains are separate and held only by weak intermolecular forces, which is what thermoplastic means and is why it is recyclable. It is also a homopolymer, since it is built from one monomer, chloroethene, so option (a) is true as well and this question turns on which classification the examiner intended.