are called insulators. are called conductors. are called non-metals. are called resistors.
I gave my students this multiple choice question: Materials that let electrons flow very easily from one atom to another

Only one answer is correct among these 4 choices:
- are called insulators.
- are called conductors.
- are called non-metals.
- are called resistors.

Could you tell me which one is correct?

are called conductors.