In paragraph 2, why does Hoover say that within the Bill of Rights "are the invisible sentinels which guard the door of every home"? A. to emphasize that Americans must be responsible for defending their own homes from invaders B. to suggest that without the Bill of Rights, Americans would be exposed to serious dangers C. to recommend that more military power may be necessary to enforce the Bill of Rights in America D. to assure Americans that no matter what happens, their homes and families will be safe from harm