The phrase that best describes the plot archetype in this story is D. Fall from innocence.
From the information, it was stated that everyone in a small town is proud of how upright and moral they are but then one day, a slick stranger comes to town promising a cash reward to the most upright citizen.
Suddenly, the citizens find they will do anything to win the cash as they'll lie. This shows the Fall from innocence.
In conclusion, the correct option is D.
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