Concept:Doping is the controlled addition of impurities to a semiconductor to increase its electrical conductivity.
Explanation:A pure semiconductor has low conductivity because it has very few free charge carriers.
When small amounts of specific impurities are added, extra electrons or holes are introduced.
Impurities that donate extra electrons produce an n-type semiconductor.
Impurities that create missing electrons produce a p-type semiconductor.
Both types conduct electricity better than the pure material.
This deliberate addition of impurities is called doping.
Rectification only converts alternating current into direct current, so it is not correct.
Emission is the release of light or charge carriers, not the addition of impurities.
Stabilization helps maintain steady performance but does not increase conductivity by adding impurities.
Therefore, the process described in the question is doping.
Answer:C. Doping