Which of the Following Is Often Seen as a Benefit

Which of the following is often seen as a benefit of federalism,according to your textbook?

A) It encourages hyperpluralism.
B) It allows states to function as laboratories of democracy,or policy innovators.
C) It creates conflict between national and state governments.
D) It creates more opportunities for interest groups to wield influence.
E) Both a and d are often seen as benefits of federalism.