The correct answer to this open question is the following.
Although there are no options attached we can say the following.
Was the U.S justified in placing Japanese Americans in internment camps?
No, I don't think so. President Roosevelt was not justified in ordering executive order 9066 which resulted in the internment of Japanese American citizens. It is true that some of his cabinet members -such as the Secretary of Defense- believed that the executive order was necessary and justified. However, that order treated Japanese American people as a prisoner of war, isolated in the interim camps such as Manzanates, California, and that was not a way to treat an American citizen.
For some historians, those camps resemble in concept, the Nazi camps of World War II, taking into consideration the proportions of this comparison.
Besides, there was no real evidence that proved that these Japanese Americans were spies or had ties with the Japanese Army