Answer:
Losing Willoughby.
Step-by-step explanation:
Jane Austen's "Sense and Sensibility" revolves around the story of two sisters, Elinor and Marianne Dashwood, and how they managed to move on with their lives despite their 'inferior' status. The story deals with themes of love, sensibility, marriage, money, social class, inheritance, etc.
In the given excerpt from chapter XXXIV of the novel, John Dashwood said of his step-sister "Marianne" that she'd been "quite as handsome as Elinor.- Now you see it is all gone." This was because of her lost love, rejection, and betrayal by John Willoughby. Several lines before this, the author writes about Marianne's "own wounded heart" which was a result of this betrayal. This seems to be the main reason for the loss of her beauty, according to John Dashwood.
Thus, the correct is the second option.