Answer: D
The answer is D because the information following "message" is the message. A colon is appropriate (as used in D) when the information after the colon describes or represents the word or phrase that comes before the colon.
Examples
Examples is the correct answer because the sentence says that they "can be both real and hypothetical". In the answer choices examples best fits because these can be real or hypothetical. Testimonies are always someone's truth. Statistics are also real. Narrations are real as well since they tell a story about someone.
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