Answer:
"One Thousand Dollars" is a short story about generosity and the use of money by American writer William Sydney Porter, as well as other O. Henry (his pen name) short stories, it also has a surprise ending.
Gillian acknowledges he doesn't have financial education and he doesn't really know what money is about and what to do with it other than give it away, he've learned how to be happy without big amounts of it, he realizes his uncle's legacy would become a hassle that would make him unhappy; in the end he chooses kindness over riches and generously lies about his money actions so the person he loves (Miss Hayden) can receive the prize. Thereby (D.)
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