Answer:
B. They are neither a state nor a part of a state.
Step-by-step explanation:
Washington, D.C. (District of Columbia) is the capital of the United States, but it is not regarded as a separate country or part of the state. It is the federal capital which is a special federal district. As such, Washington DC does not have a voting representative in Congress and the residents of Washington DC do not vote.
Even though around 700,000 people are living in Washington, D.C they do not have representatives in the state. They have a delegate in the House of Representatives but they are not allowed to cast their vote.