Hello.
I would say that the most suitable answers are: A. the greatest presence of industry in the North and C. the large amounts of foreign aid received by the North.
I chose these two options because according to historians the North was more industrialized and produced the 90% of its firearms and even the North had a richer agriculture than the South. Also, historias agree that the North had more foreign support than the South, even slaves form the South fought in the Union armies. These two options are the most suitable causes of the North's victory during the Civil War.
Hope this helps.
The North's greater presence of industry contributed significantly to its victory in the Civil War due to its ability to produce war supplies, maintain better logistics, and support its larger population. Additionally, the North's agricultural output and transportation infrastructure also supported its war effort. Therefore, option A is the best answer.
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