Ur answer is in fact E, The North was running out of ways to finance the war.
Answer:
The people of the area had pre-existing Socialist ideas.
Explanation:
The Socialist Party of Oklahoma was centered in the former Indian Territory because its leaders considered that its socialist ideas, which included (and still include today) concepts such as collective ownership of land, centralized planning of the economy, equality absolute between individuals, etc., were similar to the concepts of property that were established in the laws of the Native Americans. In this way, by establishing their centers in the native territories, the leaders of the Oklahoma Socialist Party believed that there they would have high rates of support, which would allow them little by little to grow in national politics.
It propelled both the soviet union and United States to global superpower status, therefore ushering in the cold war.
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The WPB or War Production Board set the products that would be needed for war and they determined their pricing.
So I agree with you, the answer is A.
But I must admit I was a bit iffy between A and D but I'd still say that A is a better choice.
Hope this helped