Why is copper used for most electrical wiring? it has high voltage. it has low voltage. it is a good conductor. it is a good insulator.

Option C

Explanation:

The best material to be used as an electrical wiring is the one which is capable of carrying the electric current to its maximum efficiency. Copper is known as  one of the best conductors of electricity because of its readily available electrons which require only a small energy to get excited and move in order to transmit electricity.  

A good insulator stops the flow of electricity and hence option D is incorrect

Hence, option C is correct

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