Answer:
D- A state passes a law that contradicts the nineteenth amendment
Step-by-step explanation:
The Supremacy Clause, found in Article VI of the U.S. Constitution, establishes that federal laws are the supreme law of the land and therefore all states, federal officers and judges are bound by them, meaning that in case of a conflict between state and federal laws, federal laws are the ones that shall prevail.
Because of the existence of this clause, the states know their limits: they are aware that federal law takes preference over state law, therefore, so it is unlikely that a state decides to pass a law contradicting the 19th Amendment.