In Romantic literature, authors often focus on themes such as nature, emotions, individualism, and the supernatural. Therefore, the most likely premise of a story written by an author of Romantic literature would be:
B. The supernatural is a source of great mystery and joy.
Romantic literature typically explores the mystical and supernatural elements, emphasizing the wonder and awe inspired by the unknown. Authors in this genre often depict supernatural occurrences, fantastical beings, or mysterious events to evoke a sense of wonder and fascination in the reader. This premise aligns with the Romantic emphasis on imagination, emotion, and the exploration of the unexplained, making it a common theme in Romantic works.