In Chekhovs play, The Cherry Orchard, which character undergoes the most significant psychological shift and how does this shift manifest?

In Chekhovs play, The Cherry Orchard, which character undergoes the most significant psychological shift and how does this shift manifest? You may only choose ONE character. We must ONLY use the link I pasted below.

http://www.gutenberg.org/files/7986/7986-h/7986-h.htm

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