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Insulation is keeping the hot material hot and vice versa. There is no one best insulator but many. Blanket is one example of a good insulator that keeps you warm.
Metals like sodium (Na) are the best conductors.

Silicon (Si) is a semiconductor---somewhere in between a metal and a non-metal.

Carbon (C) is a non-metal, and in theory would be considered an insulator as most nonmetals are. However, graphite can conduct electricity and so can carbon nanotubes. These are exceptions to the general rule that nonmetals are insulators because of their special structures.

So C should be your answer, but it is an iffy question to begin with. Easier if the non-metal was something like sulfur.this is he correct answer
Si.

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