Answer:
D. rule by a single leader with unrestrained power.
Explanation:
Autocratic rule or autocracy is a system of government where a single leader (autocrat) possesses absolute rule or unrestrained power over the state. An autocrat is neither answerable to external forces nor regulated.
The Russian autocratic rule known as the Tsaris autocracy, was governed by the Tsar. They controlled power, wealth and its distribution and also religious issues. The Tsaris autocracy was abolished in 1917.