The correct option is C. Isolationism type of attitude the United States adopt when World War I began. President Woodrow Wilson declared the United States would remain neutral when World War I broke out in Europe in 1914, and many Americans backed this noninterventionist stance.
Due to the hypervigilant state that the war had placed US society in, there were outbursts of violence directed at those who were perceived as being unfaithful to the country. German-Americans were the ones that suffered the most. Threats and harassment were also directed at socialists and immigrants.
Most Americans hoped that if a war broke out, it would only include Serbia and Austria-Hungary. They failed to see the need for involvement from other countries. They were unaware that a network of alliances would inevitably assemble all the major European nations on one of the two sides.
Learn more about WW1 here:
https://brainly.com/question/14387086
#SPJ2