A
Teflon
B
Neoprene
C
Polystyrene
D
Polythene
Correct answer: (b) Neoprene
Explanation
- A
Teflon
(a) Teflon. PTFE is a thermoplastic fluoropolymer; it softens on heating and is processed as a thermoplastic.
- B
Neoprene
(b) Neoprene. Neoprene (polychloroprene) is a synthetic rubber—an elastomer, not a thermoplastic. That exclusion is the official key.
- C
Polystyrene
(c) Polystyrene. A standard thermoplastic (styrofoam, CD cases).
- D
Polythene
(d) Polythene. Polyethylene is the most common thermoplastic.
Summary. Official key is (b). Neoprene is an elastomer, not a thermoplastic. Teflon, polystyrene and polythene are thermoplastics.