In a System of Federalism,state Governments and the Federal Government

In a system of federalism,state governments and the federal government:

A) are organized so that the federal government must approve all state laws throughout the nation
B) are organized so that state governments have the freedom to determine on their own which federal laws to follow and which federal laws to ignore or nullify
C) are organized so that the federal government may, under some circumstances, dissolve lower levels of government
D) are organized so that the federal government is empowered to impose and enforce any laws on the states that it deems "necessary and proper" to improve the lives of its citizens
E) are organized so that both have separate and shared powers