How Did the War Experience Change the Attitude of Young

How did the war experience change the attitude of young African American men in Harlem in the early 1920s?

A) They brought home a militant spirit and maturity that gave them the confidence to express their beliefs and sentiments.
B) The horrors they had witnessed in the war convinced them of the importance of compromise to avoid violent conflict.
C) Their exchanges with Parisian artists introduced them to high culture for the first time in their lives, making them eager to copy it back home.
D) Their mutual service with white Americans gave them a more nuanced vision of the racial conflict that was brewing back home.