Which of the Following Is True About Preemption

Multiple Choice

Which of the following is true about preemption?

A) When the federal government enacts laws in an area, state laws that conflict are retained.
B) If a federal law preempts a subject; state law that attempts to regulate it is unconstitutional.
C) Preemption does not apply to federal statutes.
D) The concept of preemption arises from the contract clause.
E) If a federal law preempts a subject; state law that attempts to regulate it is constitutional.