Identify the segment in the sentence which contains a grammatical error.
We require the efficient electrician for changing the wiring of our house.

Correct option is C

Option (c) contains an error.
Explanation:
· The article “the” is used before specific or already-known nouns.
· Here, “an efficient electrician” is the correct phrase, since no specific electrician is being referred to.
Correction: We require an efficient electrician for changing the wiring...
Grammatical rule used:
· “An” is used before singular countable nouns beginning with a vowel sound when referring to one among many.
· “The” is used when the noun is specific or previously mentioned.
Example:
We need an honest person.
I met the doctor you told me about.