The Molecular- Orbital Model for Ge Shows It to Be

The molecular- orbital model for Ge shows it to be

A) an insulator, because all the lower energy band orbitals are filled and the gap between the lower and higher bands is large.
B) a conductor, because its lower energy band orbitals are only partially filled.
C) a conductor, because all the lower energy band orbitals are filled and the gap between the lower and higher bands is large.
D) a semiconductor, because the gap between the filled lower and empty higher energy bands is relatively small.
E) a semiconductor, because the gap between the filled lower and empty higher energy bands is large.