Verified Answer :

Answer: Option (c) is the correct answer.

Explanation:

Graphite is an allotrope of carbon atom. Also, being a solid it is able to conduct electricity due to the presence of free or mobile electrons.

Whereas in solid form potassium chloride, sugar and silver cannot conduct electricity as there are no free electrons present.  

Thus, we can conclude that out of the given options, graphite is the solid which conducts electricity most efficiently.

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Graphite is the solid that conducts electricity most efficiently.

WHAT IS A CONDUCTOR?

A conductor is a substance that has the ability to conduct electricity and heat unlike an insulator that is incapable of doing that.

Graphite is an allotrope of carbon that is made up of free electrons in its atomic configuration, hence, allowing it to conduct electricity effectively.

Pottasium chloride, silver and sugar do not contain free electrons like graphite, hence, are less efficient conductors.

Therefore, graphite is the solid that conducts electricity most efficiently.

Learn more about conductor at: https://brainly.com/question/18084972

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