When the First World War Began,the Army's Highest-Ranking Black Officer

When the First World War began,the army's highest-ranking black officer was

A) promoted to general in order to emphasize the army's commitment to racial equality.
B) placed in overall command of the army's several all-black regiments.
C) removed from duty ostensibly on medical grounds,though possibly because he would outrank white officers leading all-black regiments.
D) thrown in prison for publicly avowing that if Congress did not grant black men their rights while they were fighting in Europe,then they would continue fighting once they returned home.