Answer:
A. The narrator challenges tradition.
Step-by-step explanation:
A challenge of tradition in literature indicates that an author chooses to change what would normally be expected in the plot climax, as the element of surprise makes for a uniqueness factor in the story.
Regarding the example, the princess would normally be glad the prince saved from the clutches of the dragon, but the author chooses to change that old tradition in their story, so the princess might react differently in this one.