The Fact That the Supreme Court Denied the National Government

The fact that the Supreme Court denied the national government the power to fully ban handguns in 2008, yet a later 2010 decision was needed to apply this same rule to the states is emblematic of

A) the power of the states.
B) the weakness of the federal government.
C) the slowness with which federal rules apply to the states.
D) the doctrine of incorporation.
E) the power of the states and the weakness of the federal government.