Verified Answer :

Metals are the best conductors and insulators. 

Answer: Option (a) is the correct answer.

Explanation:

Metals are the substances that contain excess of electrons. Therefore, they have mobile electrons which tend to move from one place to another.

As a result, when current or heat is supplied to them they conduct electricity. Hence, metals are good conductors of heat and electricity.

Thus, we can conclude that out of the given options, metals is/are usually the best conductor/s.

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