World War I also known as first world war was begun in 1914 and end in 1918. It involved many of the Europe countries.
United States join the WWI in 1917 and declared war on Germany. U.S. reserved the Germany army. It boosted the morale of Allies. So the option (D) It helped bring quick victory to the Allies is correct.
Thus, It helped bring a quick victory to the Allies. (D) is correct.
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