Answer:
Madeline wanders in a distant hallway while looking at the horizon in despair. (COMPLEX SENTENCE) 1. Madeline wanders in a distant hallway although her feet can't take the route anymore. (COMPOUND-COMPLEX SENTENCE) 2. usher sings a melancholy song with an unknown melody, although the meaning was clear. (COMPLEX SENTENCE).
The subject does agree with the verb because the subject is students and the verb is use. The subject is plural and the verb is singular.
Your answer is going to be the second choice.
hope i helped love :)
