Rubber is a good conductor of electricity.

Insulator

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Conductor

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Solution

The correct option is A
Insulator

Electric current is a flow of charges. Electricity passes through a material when there are free electrons present in them. Materials that don't conduct electricity (with very few free electrons or even no free electrons) are called insulators. Rubber is an insulator as electrons are tightly held so that no electrons are free to move.

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