D. completing formal schooling.
Answer:
The United states came to the aid of SK at the head of UN forces composed of than a dozen countries the main reason was ro aid SK and Stop the Spread Of Communism
The treaty of versailles was unfair towards Germany, so that would probably the spark on the western front.
Hitler prepared rather long for an all out war, he took parts of former germany back in peace. Later the USSR (union of Russia and a lot of other countries) took Poland together. (they had a non-attacking treaty). With attacking poland, France and the UK declared war and Germany took over France, Belgium and Holland almost instantly
Roosevelt's speeches were memorable for a variety of reasons, but the best option from this list is: "It compared Americans to an army"--all fighting together for the same cause.