The way the African American men serving in the military were treated differently by the French during World War I was D. Unlike Americans, the French treated them as equals.
This refers to the discrimination that a person faces as a result of his ethnicity, or race and does not have equal access like others.
Hence, we can see that in World War I, the white boys in the American army were racist towards African Americans, but their French counterparts treated them with respect.
Therefore, option D is correct.
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