The Original Intent of the Supremacy Clause Was to Ensure

The original intent of the supremacy clause was to ensure which of the following?

A) The national government would prevail over states when both governments were acting in a constitutionally correct manner.
B) The state governments would prevail over the traditional areas of state concern such as crime and education.
C) The Supreme Court had the final say on what is or is not constitutionally permitted.
D) The President was the supreme commander of the military.