Why are plastics poor conductors of heat and electricity?

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Plastics are not good insulators, so they cannot conduct heat or electricity

Plastics have low density, so they cannot conduct heat or electricity

Plastics have low high resistance to the flow of heat or electricity

Plastics have high resistance to the flow of heat or electricity

answer is B.

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Detailed Solution

Plastics are poor conductors of heat and electricity because they have high resistance to the flow of heat or electricity.
This is because plastics are made of long-chain polymers that do not have free electrons like metals.
As a result, the electrons cannot move freely through the material, and the heat or electricity cannot be conducted efficiently.