Concept:An oligarchy is a government controlled by a small group of people.
Explanation:In an oligarchy, the few people in power often use that power for their own benefit.
This matches the description given in the question.
Autocracy and monarchy both mean rule by one person, not by a few.
A tyranny refers to harsh or oppressive rule, which may involve one ruler or a small group, but the exact term for rule by the few is oligarchy.
Therefore, the correct choice is oligarchy.
Answer:C. Oligarchy