When Silicon (Si) Is Doped with Gallium (Ga), Electrical Conductivity

When silicon (Si) is doped with gallium (Ga) , electrical conductivity increases because gallium

A) has fewer valence electrons than silicon so holes are created in the valence band of silicon.
B) has more valence electrons than silicon so electrons are added to the conduction band of silicon.
C) causes electrons to be transferred from the valence band of silicon to the conduction band of silicon.
D) causes electrons to be transferred from the conduction band of silicon to the valence band of silicon.
E) is a better conductor of electricity than silicon.