B. Nell exposes the lie and proves that Hamish is innocent, allowing the friends to compete against each other.
This conclusion aligns with the theme of good sportsmanship, as it emphasizes fairness, integrity, and the importance of allowing the best competitors to showcase their skills in a legitimate competition. By standing by her friend and standing against the accusation, Nell not only upholds the spirit of the tournament but also demonstrates true sportsmanship.