The sentence is correct, as all the words were spelled correctly and positioned coherently.
However, it is necessary to remember that at the end of a sentence, a period must be added and the sentence is not showing the period.
The question is incomplete. The full question is: The last row was unoccupied until a rider boarded at the next stop. Correct or incorrect?
More information about textual coherence at the link:
https://brainly.com/question/2773425