In the given sentence identify the segment which contains the grammatical error.
Vincent Jonson, a musician, are going to lead an 80-man naval band in the Republic Day Parade this year.

Correct option is A

Option (a) contains an error.
Explanation: The subject “Vincent Jonson” is singular. Therefore, the verb must also be singular. The use of “are” is incorrect here. It should be replaced with “is” to maintain subject-verb agreement.
Correct sentence: Vincent Jonson, a musician, is going to lead an 80-man naval band...
Grammatical rule used: In subject-verb agreement, a singular subject takes a singular verb. Appositive phrases (like “a musician”) do not change the number of the subject.
Example: Ravi, a teacher, is attending the seminar.
Information Booster:
When the subject is followed by additional information within commas, always ensure the verb agrees with the main subject, not the descriptive phrase.