Kojaxta
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What is a key difference between a theme and a central idea?

A. A central idea is specific to a genre, such as epic poetry, while a theme is specific to a medium, such as written text.
B. A central idea is relatively neutral, while a theme makes some kind of moral point.
C. A central idea is a concept that a written work suggests, while a theme is a concept that a work states directly.
D. A theme is revealed by characterization or plot, while a central idea is revealed by rhetoric or a direct statement.

UPDATE: ANSWER IS D.