Conductivity of an extrinsic semiconductor is considerably influenced by : 

The conductivity of an extrinsic semiconductor is considerably influenced by 1) Majority charge carriers originating from doping.

Explanation:

Extrinsic Semiconductors:

• These are semiconductors that have been doped with impurities to increase their conductivity.
• Doping introduces either an excess of electrons (n-type) or an excess of holes (p-type).

• Majority Carriers:
  • In n-type semiconductors, electrons are the majority carriers.
  • In p-type semiconductors, holes are the majority carriers.
  • The concentration of these majority carriers is significantly higher than the concentration of minority carriers.
• Conductivity:
  • Conductivity is directly proportional to the concentration of charge carriers.
  • Since doping greatly increases the concentration of majority carriers, they have a much greater influence on conductivity than minority carriers.
• Minority Carriers:
  • Minority carriers are generated by thermal agitation.
  • Although minority carriers contribute to the current, their number is very small compared to majority carriers.
  • Therefore, they have very little effect on the conductivity of an extrinsic semiconductor.

Therefore, the correct answer is:

• 1. Majority charge carriers originated from doping