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B
wood
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C
copper
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D
none of these
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Solution
The correct option is B
wood
Explanation for correct answer
Substances that do not allow electricity to flow through them easily are called insulators .
Wood is a non-conductor of electricity or an insulator. Hence option (b) is the correct answer.
Explanation for incorrect option Option (a) and option (c) are substances that allow electricity to flow through them easily called as conductors ,electricity can easily flow through them