Which term best captures the sentiment of Kim's expression upon returning from the party?

The term "triumphant" best captures the sentiment of Kim's expression upon returning from the party, as it conveys a sense of victory, achievement, or overcoming obstacles. This suggests that Kim had a successful experience at the party, possibly feeling proud or content with her social interactions or accomplishments that took place there.

In contrast, "joyful" might imply a more general sense of happiness, which could be too broad if Kim's feelings stemmed from a specific accomplishment rather than just enjoyment. "Apathetic" indicates a lack of interest or enthusiasm, which would not align with the positive sentiment of returning from a successful party. Lastly, "upset" denotes negative emotions, which would contradict the notion of Kim feeling triumphant. Therefore, "triumphant" captures the nuanced sense of success and fulfillment that likely characterized Kim's return.