Popular Sovereignty is your answer.
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The answer is B MacArthur wanted to become more aggressive and invade China. After China intervened in the Korean war when it was close to being finished MacArthur wanted to punish China by bombing and invasion to beat China in a war. Trumans policy was to just hold onto Korea and not engage Cina on land. At the time the US was worried about an invasion of Europe by the USSR and felt a war with China in asia was the wrong war at the wrong time.
I think the answer is A. But don’t quote me
They were accepted as fighters in the war in voluntary units but the units themselves were segregated from the rest of the army. They had assignments that had to be done and these assignments were in units that were completely african-american or hispanic and they never mixed with the white soldiers.