Answer:
A. Checks and balances
Explanation:
The System of Checks and Balances is a system in which each branch of the government has typical and atypical powers. These atypical powers are created to limit the other branches' powers, so neither of them exceed their powers. One example of the checks and balances system is the power that the President has of vetoing laws that are passed by the US Congress. Although the main power of the Legislative branch is to create laws, the President has the power to veto them as an atypical power of the Executive Branch.