Solid-State Chemical Sensors Are Manufactured Using Semiconductors Such as Si

Solid-state chemical sensors are manufactured using semiconductors such as Si and Ge.Doping enhances the conductivity of Si.Which is NOT true for doping of silicon?

A) Doping replaces some of the silicon atoms with atoms of different elements.
B) Doping silicon with phosphorous enhances silicon's conductivity by providing an extra conduction electron that is free to move through the crystal.
C) Doping silicon with aluminum enhances silicon's conductivity by creating a vacancy in the crystal called a hole,which behaves as a negative charge carrier.
D) n-type silicon has excess conduction electrons.
E) p-type silicon has excess holes.