C. They reveal how the characters’ moods change.
I would have to say B. You wouldn't put an authors name at the end of the story (Unless it's a paper you're writing). C also falls in the category of a paper and D doesn't seem like you should add it at the end of a story.
To be thus is nothing is when Macbeth is talking about not being as safe as king.
The answer is about being the king.
Fall.
The sentence should look like:
He might play soccer this fall, or he might play decide to play football.
