The two statements from the text that support Mrs. March's claim in paragraph 17 that Amy is conceited are:
A conceited person is someone that is proud and materialistic. These two excerpts from the text reveal that Amy is a materialistic and proud person.
In paragraph 5, she retorted sharply and saw another's stance as rudeness. She also wished to have a fraction of the money that Laurie had spent on the horse.
In paragraph 6, Amy incurred debt to keep up with the latest fashions. All of these show that Amy is conceited.
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