Identifying Allegory in Literature

In literary analysis, allegory is a device used to convey more profound moral, spiritual, or political meanings through symbolic figures, actions, or events. It often requires an understanding of both the literal and the underlying meanings of the narrative. Consider the excerpt below:

"In the land of the blind, the one-eyed man is king."

This statement suggests a deeper commentary on perception and wisdom versus ignorance. Based on this context, which of the following literary works serves as the best example of allegory, where characters and events maintain a dual significance beyond the narrative surface?