Which of the Following Statements Is True of the Supremacy

Multiple Choice

Which of the following statements is true of the Supremacy Clause of the U.S.Constitution?

A) A particular federal statute cannot exclusively regulate a specific area or activity.
B) Any state or local law that "directly and substantially" conflicts with valid federal law is preempted.
C) A particular federal statute can expressly provide for exclusive jurisdiction.
D) Any state or local law that "directly and substantially" conflicts with valid federal law is held valid until such a time that the relevance of the federal law is tested and held in harmony with the cultural diversity in the state.