Answer:
Better Get Ready For the Judgment
Gabe's song, "Better Get Ready For the Judgment," and his hallucination that hellhounds are in Troy's yard warn Troy to change his behavior unsuccessfully because Troy does not hear the message.
I think you should read it yourself
C) Celebrate. This would make better sense, since it isn't having a claim to recognize something when it already is a holiday. Observing something would simply be to inspect. Mark is definitely not your answer and you should know that the last ones available aren't reasonable! So the answer is C)