The quotes that supports the answer to Part A is D. Over the next two decades, the United States would sit on the sidelines as the Treaty of Versailles.
It should be noted that a quote simply means a group of words that are taken from a text or someone's else speech.
In this case, from the complete question, the quote that supports part A is that over the next two decades, the United States would sit on the sidelines as the Treaty of Versailles and the ineffective League of Nations would set the stage for an even bloodier clash.
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