The correct answer is B) voter independence.
The chief characteristic of Washington politics since World War II is voter independence.
Voter independence is one of the characteristics of politics in Washington, where national enonomical and political decisions are made. After World War II, the two main political parties in the United States have been the Republican Party and the Democratic Party. Voter independence has allowed deciding what party and candidates are the best fit for the country and the state's interest. The House of Representatives and the Senate have the responsibility to perform serious legislative work to support the citizen's issues. That is why the voted for them to be in Congress.