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The correct answer would be Combat the rise of military aggression from Germany and Italy
Over the timeline, we see Italy and Germany gradually expanding and imposing their rule over various areas after Hitler takes office as the fuhrer. Germany at that time had great military power, and along with Italy, the two were significantly powerful. Through this we can deduce that the US then supported the Allies by supplying them with arms after they had declared war against Germany in 1939 in hopes that the Allies would be able to defeat them.
Hope this helps.