Answer:
can ride in first-class cars on the railroads and in the streets,” wrote journalist T. McCants Stewart. “I can stop in and drink a glass of soda and be more politely waited upon than in some parts of New England.” Perhaps Stewart’s comments don’t seem newsworthy. Consider that he was reporting from South Carolina in 1885 and he was black.
The Palmer rides were rides on radical leftists - regardless of their skin colour. With this information we can reject the first two answers which are connected to racism.
The Sacco and Vanzetti was a trial of two anarchists that the people have found biased: this shows that the events were motivated by the fear that American values were threatened by radical ideas (such as leftist and anarchist ideas)
During World War II there were two sides: the Allies, which the US were a part of, which included, among others, UK, France, Soviet Union (after 1941), and the allies (Germany, Japan, Italy and their puppet states).
So the answer can be any of the allies: UK, France, Soviet Union but also the whole of Latin America, most of Africa and Asia.
I think it's D. (I'm just guessing)
