Final answer:
Stephen King's big money break was selling the film rights to one of his novels.
Step-by-step explanation:
The book does not mention King winning a lottery or inheriting a fortune from a distant relative as his big money break. While King has had success selling the film rights to several of his novels, the book does not specifically state that it was his big money break. The book does not mention King getting a high-paying job as a professor as his big money break either. Therefore, the correct answer is b) Selling the film rights to one of his novels.