Your answer is A, it’s subject matter.
Explanation:
Subject matter is what something is about. An example of subject matter is a paper written about dogs. The thing or things considered in a book, course of instruction, discussion, etc. Whatever is in dispute; the actual cause of the law suit; the issue about which a right or obligation has been asserted or denied.
In general, fiction refers to plot, settings, and characters created from the imagination, while nonfiction refers to factual stories focused on actual events and people. However, the difference between these two genres is sometimes blurred, as the two often intersect.
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