Answer:
D. A genre called fan fiction
Explanation:
Fan fiction (usually referred to as fanfic for short) is the piece of writing done by fans and based on the existing piece of art (book, TV show, movie, etc.).
The fan fiction revolves around existing characters and places imagined and produced by other writers, directors, or screenplay writers, but the writer adds characters, events, and happenings not existing in the original piece of work. They can explore the works of others, while creating something of their own.
The writers shouldn’t earn any money from fan fiction, as the original pieces of fiction are copyrighted. Various owners of the rights have had different reactions, some even prohibiting and rejecting fan fiction completely.
The term started being used in the 20th century, and the popularity of fan fiction rose rapidly with the global usage of the internet. Today there are many sites designed solely for fan fiction publishing.
