Why was the Soviet Union able to prevent Germany from advancing toward
Moscow?
A. The Soviet army had more soldiers than the German army, and
German soldiers were not prepared for the harsh Russian winter.
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B. The Soviet Union signed a nonaggression pact with Germany that
stopped Germany's invasion.
C. The Soviet Union combined forces with the United States, and
both armies were able to expel Germany from Russia.
D. The Soviet Union launched a massive air assault against German
troops that allowed Soviet land-based forces in Moscow to protect
the city.