Which of the Following Is True of a Federal System

Which of the following is true of a federal system of government?​ 

A)  It ensures that national powers are not expanded at the expense of the states.​ 
B) It makes it easy to coordinate government policies at the national, state, and local levels. 
C) It prohibits the political and cultural interests of regional groups to be reflected in the laws governing those groups. 
D) It requires that state laws be uniform, thus making it easy to engage in business transactions that cross state borders. 
E) It hinders business because of red tape created by regulations at all governmental levels.