Whereas the successful prosecution of the war requires every possible protection against espionage and against sabotage . . . I hereby authorize . . . [the creation of] military areas . . . from which any or all persons may be excluded, and . . . the right of any person to enter, remain in, or leave shall be subject to whatever restrictions the Secretary of War or the appropriate Military Commander may [determine]. —Executive Order 9066, 1942
Use the passage to answer the question.
What use was made of this order, which set up military areas where the Secretary of War controlled who would enter the place, who would leave or stay, and who was excluded?
A. This order set up camps where Japanese Americans were forced to live during the war.
B. This order set up camps where soldiers could recover from combat.
C. This order set up segregated training camps for African American soldiers.
D. This order set up camps for spies caught during the war.