Answer:
The battle is significant in the course of World War II because it is seen as Hitler's last major offensive in the war. While the battle was intended to split Allied lines and force negotiated peace, American forces were able to contain the battle and inflict heavier losses on the German forces.
I'm at least 85% sure that the answer would be A, it seems like the most secure answer to give.
It provided free and safe travel across the Silk Road, it isolated Russia, and helped spread the bubonic plague
Archduke Franz Ferdinand, Archduke of Austria-Este's assassination triggered WWI