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The correct answer is D: the main point the author is trying to make.
Here's why:
1. The central idea of an informational text is the primary point or message that the author wants to convey to the readers. It is the overarching theme or focus of the entire text.
2. While details, examples, and supporting evidence are important components of an informational text, they all serve the purpose of reinforcing or supporting the central idea.
3. Understanding the central idea helps readers grasp the core message of the text and guides them in extracting the most important information from the content.
So, in summary, the central idea is like the backbone of the informational text, providing a clear focus and direction for the reader to comprehend the main point the author is communicating.