Answer:the overthrow of the tzar
Explanation: the tzar leadership being overthrown put russia into a civil war which forced russia to withdraw from WWI
The overthrow of Tsar Nicholas II directly preceded Russia’s determination to withdraw from World War I.
The overthrow of Tzar Nicholas II ended Romanov dynastic rule in Russia and the Russian Empire.
Russia's withdrawal was due to exhausted forces in an already stretched World War I.
The withdrawal from World War I began after Tzar was removed from power.
The revolution at home led to the rise of communism under Vladimir Lenin.
Thus option C is the correct answer.
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