The Isle of Man has never been a part of the United States of America!. This is false information and should be corrected to reflect the right answer of the United Kingdom. Otherwise what is the point in doing a quiz if the answers are completely wrong?
The Isle of Man does not 'belong' to the United Kingdom. It is a Crown Dependency and is therefore self-governing. While the United Kingdom is responsible for its defence, this is a misleading one question quiz!