The correct answer is A) autocracy or oligarchy.
Although there are differences among individual nations, communist governments are usually a form of either autocracy or oligarchy.
Communists governments have been associated with dictators or absolutists leaders. We have many cases in history.
Let's talk about one. General Joseph Stalin, leader of the Soviet Union.
Joseph Stalin was a military man that was a dictator, an absolutist, and showed no mercy to his enemies and rivals. He and his group of people ruled the Soviet Union and some other Eastern European nations such as East Germany, Czechoslovakia, Hungary, Poland, and Rumania.
As part of the Cold War, Stalin supported the spread of Communis, in different regions of the world, as was the case of North Korea.