If federal law appears to intend to occupy a field but was enacted for an express purpose different from state law, what legal question arises?
A) Does the Supremacy Clause automatically preempt state law in the field?
B) Can states enact laws in the same field if they do not conflict with federal law?
C) Is federal law applicable only when there is a direct conflict with state law?
D) Should states defer to federal law even if the express purposes differ?