Answer: b. They can be melted and reshape
Step-by-step explanation:
Thermoplastic polymers are those polymers which change their shape on applying heat and thus mean they are held by weak forces. Example: polythene.
Polythene can be melted and made into different shapes
Thermosetting polymers are those polymers which do not change their shape on applying heat and thus mean they are held by strong forces. Example: bakelite which is used in making electrical switches.