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In the early 18th century Charles XII of Sweden was undefeated until this happened. In 1812 Napoleons attempt to conquer Europe failed because of the same. Hitlers Operation Barbarossa was stopped by the same obstacle.

A.The frigid Russian winter
B.The lack of adequate water supplies in Northern Europe
C.The overabundance of muddy terrain in Northern Europe
D.The lack of grain in Eastern Europe
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