The correct answer is: D. no article
The article “a” or “an” is used before a singular noun that refers to a general or unspecified person or thing. In this case, the noun “electrician” is not preceded by an article because it refers to a specific person, the father of the person speaking.
The article “the” is used before a singular noun that refers to a specific person or thing that has already been mentioned or is known to the listener. In this case, the noun “electrician” is not preceded by the article “the” because it is not clear whether the listener knows the father’s name or occupation.
No article is used before a singular noun that refers to a general or unspecified person or thing. In this case, the noun “electrician” is not preceded by an article because it refers to a general occupation, not a specific person.