What is the principal difference between an autocracy and an oligarchy?

Question

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The principal difference between an autocracy and an oligarchy is the number of people in charge. In an autocracy, there is a single ruler who has complete control over the government, while in an oligarchy, a small group of people (typically wealthy businessmen or political leaders) hold the power. The other options listed do not reflect the primary difference between the two forms of government.

What Is the Principal Difference Between an Autocracy and an Oligarchy