The single-party was the party system used by the Russia government after the Communists took power.
<h3>What is a
single-party?</h3>
This is a practice of a state where only one political party has the right to form the government based on the constitution provision.
Hence, after the Communists took power, the constitution allows only for single-party to be used by the Russia government.
Therefore, the Option C is correct.
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The United States became involved in World War II only "<span>c. after Japan attacked Pearl Harbor," since this represented an unquestionable act of war against the US that needed to be avenged. </span>
That would be in an o<span>ligarchy. </span>