The above system of United States Constitution is showing three organs of the state i.e Legislative branch, Executive branch and the Judicial branch.
And below each division, their works are given. Aswecan were that, each of the organ is at same height which shows that they are practicing equal powers and they don't interrupt in each others work.
They practice the system of <u>Checks</u><u> </u><u>and</u><u> </u><u>Balances</u> to ensure that none of the organ is enjoying and grabbing too much.
So, the most appropriate option is:

Checks and balances system.
And, we are done !!
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Answer:
If you still need help so I can
Explanation:
Virginia was founded primarily for the purpose of profit by the joint-stock owned Virginia Company of London. It was also important in giving England territorial claims in America to match Spanish and French expansion, and to also give England markets and resources in the New World.
Answer:
Advances: The freeing of the slaves through the Thirteenth Amendment, the giving of citizenship to African Americans through the Fourteenth Amendment, and the protection of voting rights through the Fifteenth Amendment
Setbacks: The black codes restricted
D. Castiglione
Cesare Borgia was the Son of the Pope and Cosimo de Medici's family ruled Florence, so neither have anything to do with the royal family of Mantua. Machiavelli wrote the Prince, so that is not the correct answer either. Castiglione was part of the Royal family of Mantua and did write the Book of the Courtier. So D is the correct answer.