The title, “The Music Box's Missing Note: An Oak Grove Mystery” is most likely a work of fiction.
Answer: Option C
Explanation:
As the title suggests, the word mystery means that the writer will give his/her own narrative of the missing note, which is fictional in nature. This means that the writer is creating a story by taking a music box’s missing note as a central theme and building a story around it. If a story is built it means that it is not based on a true story. True stories are non-fiction, thus making this option C as fiction.