Here's why:
* Fantasy: The core of the story involves a giant peach, magical insects, and a journey across the ocean - elements that are clearly fantastical and outside the realm of reality.
* Adventure: James' journey inside the peach is filled with challenges, discoveries, and exciting events. The story keeps the reader engaged and on the edge of their seat.
* Children's: The story is written for children, with age-appropriate language, themes, and characters.
While it includes elements of other genres, like a bit of humor and some dark undertones, the core of the story makes it a fantasy adventure for children.