According to the text, the U.S. government is an example of an oligarchy. As in US, small groups have powers.
What is an example of oligarchy?
A historical and contemporary example of an oligarchy is Russia. In Russia, the ruling class and the wealthy are those who control the government. After the demise of the Soviet Union, which is also seen as an oligarchy, many of these oligarchs amassed their wealth.
Thus, option D is correct.
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