The story description that includes dramatic irony is:
A story follows a man’s journey as he searches for his cat, but at the end readers find out the cat went missing years before and the man’s neighbors have just been kind enough to humor him each time he searches.
Dramatic irony occurs when the audience knows something that the characters do not. In this case, the readers learn that the cat has been missing for years, while the man continues to search for it, unaware of the truth.