under article 4 of the constitution, what laws supersede all others? local laws federal laws state laws

Answer

Brief Explanations:

The Supremacy Clause in Article VI of the U.S. Constitution (not Article 4 as mis - stated in the question but generally in the context of law hierarchy) states that federal laws are the supreme law of the land. Federal laws supersede state and local laws when there is a conflict.

Answer:

B. federal laws