Respuesta :
The Answer is A of course. There is nothing wrong in the sentence.
I also took the test and got the question right. Have a great day
In the sentence, "After taking tickets and helping the guests find their seats, Sergio sat in the back and enjoyed the concert.", it remains complete as well as correct and does not need any revision. The correct answer is option A.
What are the characteristics of a complete sentence?
A complete sentence must have a subject, a verb, and an object—a minimum of three items. Usually, the subject is a noun or a pronoun.
Additionally, since all verbs require a subject, there must be a verb if there is a subject. The thing that the subject of a sentence is acting upon is known as the sentence's object.
The verb in a complete sentence must be a "finite" verb and have a subject: A sentence will not be considered complete if the main verb is in the '-ing' form.
To learn more about complete sentence here:
https://brainly.com/question/1036691
#SPJ2