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Germany's greatest problem at the beginning of the war was that it had begun a two-front war with Russia and France. The correct option among all the options that are given in the question is the first option or option "a". I hope that the answer has come to your great help.
Germany's greatest problem at the beginning of the war was that it had begun a two-front war with Russia and France. Germany went into the war thinking it would give them the stage they needed, however they weren't prepared for more than a few months of war.