Answer:
The answer is option D "All of these choices are correct"
Explanation:
The world war II as history has it had taken place between 1939 to 1945 and considering the given time, the war lasted for six years. The war took place between the most powerful countries of the world then which includes US, The soviet Union, Germany, France e.t.c.
All of the options highlighted were among the events that took place at the beginning of the World war II; the US military were being segregated, women also served in the Military and most African American units being commanded by white officers.
