Plastics are used widely these days because they:

are highly reactive

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are cheap

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conduct electricity and heat

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can be decomposed easily

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Solution

The correct option is B are cheap
Plastics are widely used because they are light, cheap, non-reactive and strong. They are also poor conductors of heat and electricity which make them a popular choice for making electrical switchboards, handles of frying pans, etc.

However, they are non-biodegradable and hence, are not eco-friendly.

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