Copper is strong. Copper is flexible. Copper is a conductor. Copper is an insulator.
I gave my students this multiple choice question: Which statement best explains the reason that electrical wires are made of copper?

Only one answer is correct among these 4 choices:
- Copper is strong.
- Copper is flexible.
- Copper is a conductor.
- Copper is an insulator.

Could you tell me which one is correct?

Copper is a conductor.