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C, Si and Ge have same lattice structure...

C, Si and Ge have same lattice structure . Why is C an insulator while Si and Ge are intrinsic semiconductors ?

A

In case of C the conduction band is partly filled even at absolute zero temperature

B

the four bonding electrons in the case of C lie in the second orbit, whereas in the case of Si they lie in the third

C

The four bonding electrons in the case of C lie in the third orbit, whereas for Si they lie in the fourth orbit

D

In case of C the valance band is not completely filled at absolute zero temperature

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