The Supremacy Clause Contained in Article IV of the Constitution

The supremacy clause contained in Article IV of the Constitution declares which of the following?

A) that the U.S. forbids foreign colonization in the western hemisphere
B) that the Supreme Court is the final and supreme arbiter of the meaning of the Constitution
C) that national laws take precedence over state laws when both properly discharge their government's respective responsibilities
D) that the President is the supreme commander of the military and cannot be overruled by Congress or the courts