keeps the wire cool. allows heat to move freely. is a good electrical insulator. has magnetic properties.
I gave my students this multiple choice question: A conducting wire wrapped in plastic protects the user because the plastic

Only one answer is correct among these 4 choices:
- keeps the wire cool.
- allows heat to move freely.
- is a good electrical insulator.
- has magnetic properties.

Could you tell me which one is correct?

is a good electrical insulator.