Answer: D. A theme is revealed by characterization or plot, while a central idea is revealed by rhetoric or a direct statement.
A theme is the central topic of a text. It is created through the plot (events of the story), the characters and the setting of the story.
A central idea is the main point that the story wants to convey. It is usually revealed directly, or by using methods of rhetoric and persuasion. Narratives are built in a way that support the central idea.
