The Advantages of a Federal System of Government Include Which

The advantages of a federal system of government include which of the following?

A) All Americans gain the benefit of uniform social services policies in every state.
B) The federal government becomes the focal point of political dissatisfaction for most citizens.
C) It is more practical to locate most power in one place.
D) State governments are frequently testing grounds for new governmental initiatives.
E) Smaller political units, such as states and cities, are less likely to be dominated by a single political group.