It should be noted that a central idea is the main idea that's in a story.
Your information is incomplete as you didn't provide the passage or story. Therefore, an overview will be given.
A central idea is the main idea that's in a story. It's the underlying message that the author wants to pass accross to the readers.
In this case, it's important to read the story and understand it. Then, one can easily deduce the central idea that's in the story.
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