Final answer:
The three-fifths clause of the Constitution laid the foundation for Southern power in the United States Congress and maintained slavery.
Step-by-step explanation:
The accurate description of the compromises made at the Constitutional Convention is option C. The three-fifths clause of the Constitution laid the foundation for Southern power in the United States Congress that maintained the institution of slavery for nearly 100 years after the delegates approved the Constitution. This compromise allowed enslaved people to be counted as three-fifths of a person for determining representation in Congress, giving the South more political power.
Learn more about Constitutional Convention compromises