Answer :
The answer is A, to complete the statement "The U.S. federal system of government is one in which both the national and state governments derive their power from the people." This is also true with democracy, we, the people are the one who elects the leader that we think is capable for leading us.
A. Both the national and state governments derive their power from the people. This answer is correct because leaders who take office in both the national and state governments are voted in by the American citizens. This in fact means that they are the people's representatives and therefore they have the power to make decisions on behalf of the people that elected them.