The US Constitution is referred to as the “supreme law of the land.” Option A is correct
The United States Constitution is The Supreme Law of the United States.
The Supremacy Clause in the Constitution states:
“This Constitution, and the Laws of the United States which shall be made in Pursuance thereof; and all Treaties made, or which shall be made, under the Authority of the United States, shall be the supreme Law of the Land; and the Judges in every State shall be bound thereby, any Thing in the Constitution or Laws of any State to the Contrary notwithstanding.”
Montesquieu's idea is that having three branches is the best, and he uses triangles as his example. His idea is also based on the checks and balances, so that not one branch wouldn't have to much power than the other.