Answer: C. Subheadings.
Explanation: A subheading is a title or heading of a subdivision, as in a chapter, essay, or newspaper article, it can be a word, phrase, or a sentence that is used to introduce part of a text. From the given options, the subheadings (corresponding to option C) is the text feature that can help organize the information in a text (essay, paper, etc) by stating or basically summarizing the main ideas of the paragraphs.
