Answer:
C. It might require U.S. troops to fight in foreign wars.
Step-by-step explanation:
President Wilson had the idea of a security system empowered by a league of nations, where this league of nations would raise and army and defend the world from those who might want to invade or conquere soveraing states, this meant that US troops might be called to action to fight in this leage of nation army, which was something that the congress didn´t like, the Treaty of Versailles was rejected and never ratified by the United States which eventually, in 1921 signed peace with the German and Austrian-Hungarian governments.