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Which of the following statements are true about insulators?

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Which of the following statements are true about insulators?

(a) Insulators have a positive temperature coefficient

(b) Insulators have a negative temperature coefficient

(c) Insulators have zero temperature coefficient

(d) Insulators have infinite temperature coefficient

I got this question in unit test.

I would like to ask this question from Temperature Coefficient of Resistance in section Simple DC Networks of Basic Electrical Engineering

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Best answer
Right choice is (b) Insulators have a negative temperature coefficient

The best explanation: Insulators have a negative temperature coefficient because as temperature increases, the resistance of insulators decreases.

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