The correct answer is "Story Presented in a book, film, or TV show that is based mainly on facts." A documentary is a type of non-fictional media that presents a story or information based on real events, people, or issues. It aims to educate or inform the audience about a particular subject by using factual evidence, interviews, and expert opinions. Unlike fictional stories, documentaries strive to provide an accurate representation of reality and often involve thorough research and investigation. Therefore, the answer accurately describes the nature of a documentary.