Sometimes When the State and Federal Governments Have Concurrent Authority,the

Multiple Choice

Sometimes when the state and federal governments have concurrent authority,the federal government can decide to regulate that area exclusively.In such a situation,according to the doctrine of ________,the state law is unconstitutional.

A) federal subrogation
B) federal preemption
C) federal privileges and immunities
D) res ipsa loquitur
E) stare decisis