Federalism Is a Way of Organizing a Nation So That

Federalism is a way of organizing a nation so that

A) power is centralized in state and local government.
B) both national and state levels of government have some authority over the same land and people.
C) there is one federal government,and all regional governments are administrative subunits of it.
D) power is centralized in the national government.
E) there are three branches of government and a system of checks and balances.