what was a cause of the russian revolution?\no a large, restless middle class\no an autocratic monarchy\no…

Brief Explanations:

The Russian monarchy under the Romanovs was autocratic. This led to widespread discontent among various segments of society including peasants, workers, and the intelligentsia. The autocratic rule restricted political freedoms and failed to address the economic and social problems of the country, contributing to the revolutionary sentiment. A large, restless middle - class was not the main cause. Military defeats in World War I, not victories, added to the unrest. The legislature was not powerful under the autocratic regime.

Answer:

B. an autocratic monarchy