Answer:
Superb
Explanation:
Superb means excellent so it is saying that the people go back due to the excellent service which makes sense.
The other options only mean the service is okay not that it is good so therefore those are the wrong answers.
Ex.
Shakespeare, a writer, wrote amazing plays.
A writer is the appositive phrase since it is referring back a noun
This is what they call a con sent a congratulatory.
