C: <span>Limited and restricted functions for the central government</span>
Answer:
There are several ways through which the political parties in the united States help citizens engage with the government.
One of the ways would be through presidential elections. People have the right to vote for the party they believe the most in. SO the political parties tend to engage the citizens into several initiatives and programs in order to win their votes.
Another way could be holding press conferences where the citizens have a chance to cross question what the political parties are up to.
You just answered your own question
An oligarchy is ruled by few people therefore, an oligarchy can not have over 50 people ruling though most oligarchies have much smaller number of leaders.
A. That the government cannot try a person more than once for the same crime.