That all appointments made by the President and an treaties signed by him must be ratified by the Senate in U.S.A. indicates
That all appointments made by the President and an treaties signed by him must be ratified by the Senate in U.S.A. indicates Correct Answer Theory of checks and balances
Ratification by Senate of any action taken by President ensures that interest of a person must not override the interest of nation thus, it indicates the theory of checks and balances.