In the U. S. this movement included populists who thought the war was one working class pitted against the other begun by the capitalists.

a. Peace Movement

c. Neutrality Movement

b. Preparedness Movement

d. Propaganda Movement

The correct answer is letter A. The U. S. movement that included populists who thought the war was one working class pitted against the other begun by the capitalists is called "Peace Movement." It is considered a social movement that seeks to reach ideals in minimizing inter-human violence, etc.