Identifying the Climax in 'Emma'

In Jane Austen's 'Emma', various events contribute to the intricate plot structure that ultimately leads to character development and thematic depth. Consider the narrative arc where Emma's matchmaking attempts come to a head. The progression of the plot not only establishes relationships but also demonstrates Emma's faults and misjudgments. The turning point comes when a particular situation causes a shift in Emma's understanding of love and friendship.

Which of the following events most effectively serves as the climax of the narrative, leading to Emma's ultimate realization about her relationships with others and herself?