What is the primary purpose of footnotes?

The primary purpose of footnotes is to provide additional content information. Footnotes are used to offer explanations, expand on ideas presented in the main text, or cite sources without interrupting the flow of the document. They allow readers to access supplementary information that may enhance their understanding of a topic or provide context without cluttering the main narrative. This additional content can include definitions, clarifications, or elaborations on points that may not be fully developed in the body of the text.

While footnotes can sometimes list references, their main function is to add value through commentary or explanation, making option A the most accurate choice. Other responses, such as replacing bibliographies, summarizing sections, or just listing references, do not capture the broader role that footnotes play in enriching the reader's experience and comprehension.