The u. s. federal system of government is one in which
1 both the national and state governments derive their power from the people
2 only the national government derives its power from the people
3 only the state governments derive their power from the people
4 neither the national nor state governments derive their power from the people

1 both the national and state governments derive their power from the people. 

We are able to vote for pretty much everybody in the national government (president and vice, for example), and with public pressure, is able to kick them out.
The state is the same. We vote for our governors, and if we don't like them, we can have them repeached.

hope this helps :D

The correct answer is b