B. The Supreme Court can declare a state law unconstitutional.
Explanation:
The Supremacy Clause establishes that all federal laws are the supreme law of the land and therefore all states, federal officers and judges are bound by it. So, if a state law is in conflict with federal law, the Supreme Court, which has the power of Judicial Review, can declare such state law unconstitutional because federal laws are the ones that must prevail.
The Constitution is the supreme law of the land giving the supreme court the power to declare a state law unconstitutional if it violates the constitution.
The answer is neutral stimulus; conditioned stimulus. A neutral
stimulus is a spur which originally makes no exact answer
except concentrating responsiveness. In classical conditioning,
when put together with an unconditioned stimulus, the neutral
stimulus turn out to be a conditioned stimulus.
