What is an unstated central idea? an idea that the author decided not to include in the text, because it might be distracting an idea that is either too controversial or too hard to prove an idea that the reader infers, because the author has not expressed it directly an idea that has been expressed so often that it does not have to be repeated

C.  an idea that the reader infers, because the author has not expressed it directly

Explanation:

Unstated Idea is a Main idea in a passage or text, however, it is not directly or expressly stated in any given sentences in a passage. It is also known as Implied Idea. This means that instead of Main Idea being explicit stated, it is however only implied or inferred with the help of other vital information in the passage.

Hence, the correct answer is option C: an idea that the reader infers, because the author has not expressed it directly

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