What was the nature of the Russian resistance to the Mongol invasion?A) The princes of Russia refused to cooperate among themselves and were routed individually.B) As the leading commercial centers of Russia, Kiev and Novgorod allied to create a substantial military force that saved those cities from destruction.C) The Russians appealed to the Byzantine Empire to provide them with military assistance against the Mongols.D) The Russian cities allied rapidly to confront the Mongols with a united force.E) The Russian peasants conducted guerilla warfare under the leadership of the Kievan Rus.

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