Why Is the Supremacy Clause Important

Why is the supremacy clause important?

A) It gives the U.S. Congress the power to regulate commerce.
B) It resolves conflicts between national and state laws.
C) It makes clear that each state's laws are to be honored by the other states.
D) It stipulates that if the national government passes an unconstitutional law, the people of the states are "supreme" and through their state legislatures can declare the law void.
E) It provides the U.S. Congress with the power to dissolve or to take control of local governments that are in financial distress.