Fantasy fiction is the genre of novel where there are heroes in a place that is usually not located in this world or has not a name. The characters or the environment has abilities beyond those of the laws of nature. The first choice thus seems like a decent candidate; we have a lion that can talk which is already supernatural and the boy has a mythical property, it cannot be defeated. The butler-detective duo would suit much more to a crime-novel, not a fantasy one since usually logic and rational clues are important to these stories. The mother-son duo is again rather inappropriate. It would be much better material for a novel involving society or drama. Finally, since the Titanic is not fictional, the last choice is also rejected; any story with passengers from the Titanic would be closer to a historical novel. Hence, the correct option is the 1st one.