Answer:
That's true, because if it is unclassified, think about it, is that document really existant or important if it went unclassified? Or is it just lost?
Well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed." Such language has created considerable debate regarding the Amendment's intended scope.
Using information and knowledge I already have, I would say your answer would be C. A hidden meaning.