None of the provided options accurately summarize the United States' involvement and military role in World War I. The U.S. entered the war on April 6, 1917, after a series of events that included the sinking of American ships by German U-boats and the interception of the Zimmermann Telegram, where Germany proposed a military alliance with Mexico against the U.S. The Selective Service Act, which established a draft, was enacted in May 1917, but this was after the U.S. had already declared war.
A more accurate summary would focus on these key events leading up to the U.S. entry into the war.