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(C) In insulators,the valence band is completely filled with electrons,and the conduction band is completely empty.There is a very large energy band g

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very high and empty.

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(C) In insulators,the valence band is completely filled with electrons,and the conduction band is completely empty.There is a very large energy band gap (typically $E_g > 3 \ eV$) between the valence band and the conduction band.Because of this large energy gap,electrons cannot easily jump from the valence band to the conduction band,even at room temperature.Therefore,the band gap is very high and the conduction band is empty.Thus,the correct option is $C$.

In the energy band diagram of insulators,the band gap and the conduction band are respectively:

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