We can deduce here that the author actually includes the title as a way to: B. sum up the subject of the chapter.
Title actually refers to the topic of a passage or article. It is usually seen at the top of a chapter of a passage that has a title. Title makes the reader know what he/she is about to read.
Thus, we can actually see that the author includes the title as a way to sum up the subject of the chapter.
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