Jane Austen Etiquette Throwdown

In your estimation, which of Marianne's etiquette faux pas in Sense and Sensibility was most egregious?

Willoughby cuts a lock of Marianne's hair

Which of Marianne's etiquette faux pas was most egregious?
	Allowing her rudeness to show to people she dislikes.
	Allowing Willoughby to cut a lock of her hair.
	Visiting Allenham alone with Willoughby.
	Mocking Colonel Brandon, Mrs. Jennings and the Middletons behind their backs.
	Accepting the gift of a horse from Willoughby.
	Writing letters to Willoughby when she arrives in London.
	Making a spectacle of herself when she sees Willoughby at the ball.
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Marianne accepts the gift of a horse from Willoughby