A solid is very hard, has a very high melting point and does not conduct electricity either in the solid state or in the molten state. It is most likely a

Aionic solid
Bmetallic solid
Ccovalent network solid
Dmolecular solid

Answer: C

An ionic solid conducts when molten, a metallic solid conducts always, and a molecular solid is soft with a low melting point. Only a covalent network solid such as diamond fits all three properties.

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