I would question whether that is indeed a 'principle'. It sounds more like a claim to me. Check out this:
https://en.oxforddictionaries.com/definition/principleIn any case, what is the 'exception' referred to in paragraph two? An exception is an actual example (
https://en.oxforddictionaries.com/definition/exception) and there's no example mentioned.
Remember that
every word in the answer must be correct. And I recommend that you make and understand a list of key terms you encounter, such as 'principle', 'exception', and 'qualifies'.