Which is NOT an example of the system of checks and balances at work?

a
The president vetoes a bill.
b
A Supreme Court justice retires.
c
The Senate refuses to approve a treaty.
d
The federal courts block an executive order.

The correct answer is letter A

The Theory of the Separation of Powers, also known as the System of Brakes and Counterweights, was enshrined by the French thinker Charles-Louis de Secondat, Baron de La Brède et de Montesquieu, in his work “The Spirit of the laws”, based on the works of Aristotle (Politics) and John Locke (Second Treaty of the Civil Government), in the period of the French Revolution. Montesquieu permeating the ideas of these thinkers and, with this, explains, expands and systematizes, with great insight, the division of powers.