Which statement best completes the following sentence?
 
One advantage of a federation is that________, but one disadvantage is that________.
citizens can participate at multiple levels of government; the national government may be too weak to provide services
citizens can participate at multiple levels of government; overlapping national and local services may be wasteful
power is concentrated on the national level; the national government may not be aware of local issues
power is concentrated at the local level; the local government may not be able to cooperate on national issues