Answer:
D.
Explanation:
Developing an essay means what process does a writer goes through in order to make an essay. Since the type of essay wasn't specified, convincing or informing a reader isn't essential, but creating three supporting paragraphs with a topic sentence and supporting details is something all essays need in order to be, well, an essay.
Percy has so much trouble deciding whether to stay year round or go to seventh grade. If he went to 7th grade he would be able to see his mom more often but if he decided to stay year round he would be able to interact with people just like him.
Maybe something like "revenge" depending on the context :)