The correct answer is B. National supremacy clause
Explanation:
The National Supremacy Clause or the Article VI in the constitution of the U.S. is the article that states the Constitution and the Federal laws or laws that apply to all states are supreme and therefore should be followed over the state laws or laws created and applied in each state, especially in the cases were the federal law and the state law are in conflict. This means due to the National Supremacy Clause state judges that deal with cases at the state level should always follow the constitution, the Federal laws and the results of cases or precedents at the Federal level, especially when the State law represent an opposition to the Federal law. Therefore, States judges follow the precedents of federal law mainly because of fo the National supremacy clause.
