Which Statement Is False

Which statement is false?

A) A material is conductive if enough electrons can move from the valence band into the conduction band.
B) Semiconductors become conductors at higher temperatures or in an electric field.
C) Electrons in a metal flow toward the positive end of an electrical field.
D) An energy band is a group of orbitals whose energy levels are widely spaced.
E) The energy level of the conduction band always overlaps the energy level of the valence band.