Which of these descriptions best fits fiction?

Fiction is defined as a genre of literature that involves the creation of imaginary events and characters. It allows authors to explore worlds and stories that are not limited by reality, granting them the freedom to invent plots, settings, and characters from their imagination. This element of creativity is what distinguishes fiction from other genres, particularly those that adhere to factual events or real-life accounts.

In contrast, literature based on real events and people pertains more closely to non-fiction, which aims to convey true stories or factual information. Written material in a regular meter typically refers to poetry, which often follows a rhythmic structure distinct from the narrative style typical of fiction. Lastly, the category of all artistic language forms is too broad, encompassing poetry, essays, and other literary forms that may or may not be fictional. Therefore, the description that focuses specifically on the imaginative aspect of prose aligns perfectly with the definition of fiction, making it the most suitable choice.