Both the government of the United States and the government of the Roman Republic resemble in the fact that they both have different government bodies check one another's powers. The Roman Republic and the United States both have a Executive and Legislative branch, that ensure to check the work and operations of the other branch. This is called a system of check and balances, which main objective is to ensure the functioning and accountability of the government from inside.
The correct answer therefore is option C, different government bodies check one another's powers.