Answer: B. Oligarchy
Explanation: All these forms of government originated and are defined in ancient Greece.
An oligarchy is a form of government where several rich people run a state or an enterprise. Since these are the few who have the majority of wealth, say in the state, then they control the state and make all the decisions.
Autocracy is the rule of an autocrat or tyrant who exercises his will over the state.
Democracy is the rule of the majority and can be the direct or indirect rule of the majority. If it is the direct rule of the majority, that is, direct democracy, then all citizens participate in decision-making. If it is the indirect rule of the majority, that is, representative democracy, then the citizens, i.e. the majority, elect democratically their representatives, who make decisions on their behalf, that is, represent them.