Here's why it's not the other options:
* Short Story: Each individual tale within The Canterbury Tales could be considered a short story, but the collection as a whole is much too long.
* Novel: While The Canterbury Tales has a framing story (the pilgrimage itself), the individual tales are not connected in a continuous narrative like a novel.
* Stage Play: The Canterbury Tales is written in verse form, and while it could be adapted into a stage play, it wasn't originally written for performance.
So, the best way to categorize The Canterbury Tales is as a collection of verse tales.