Answer:
b. If federal and state laws conflict, valid federal laws take precedence.
Step-by-step explanation:
The Supremacy Clause, which refers to Article VI, Paragraph 2 of the United States Constitution states that states are not allowed to interfere with the federal government when discharging its duties and also that states cannot assume the function meant for the federal government.
Therefore what this means is that, if federal and state laws conflict, valid federal laws take precedence.