Which word best describes the princess's demeanor?

The word "elegant" best describes the princess's demeanor because it conveys a sense of grace, sophistication, and poise typically associated with royalty. In literature, characters described as elegant often exhibit refined manners, stylish appearance, and an overall sense of dignity, which aligns well with how a princess would be portrayed.

Choosing "elegant" captures the essence of how the princess carries herself and interacts with others, reflecting not just her physical appearance but also her comportment and the respect she commands. This contrasts with the other options; for instance, "formal" implies a rigidity or strictness that may not fully encompass the gracefulness of elegance, while "casual" suggests a lack of formality and effort, which wouldn't be fitting for a princess. "Rough" indicates a harshness or lack of refinement, entirely misrepresenting the expected demeanor of a royal character.

Overall, "elegant" paints a complete picture of the princess, representing her status and the qualities that define her character in the narrative.