What does the Supremacy Clause mean?

The Supremacy Clause of the Constitution of the United States, establishes that the Constitution, federal laws made pursuant to it, and treaties made under its authority, constitute the "supreme Law of the Land", and thus take priority over any conflicting state laws

Explanation:

i would think it's industries and hydroelectric power

i think the answer would happen to be the letter b

because the bar never runs out

couples always argue