Classify the input text into either disfluent questions or proper questions. A disfluent question is a question that has some interruptions in it while framing. A proper question is the correct form of the question without any disfluency.
--------
Question: What caused the Lower Rhine region to be changed significantly?

Answer: proper


Question: What was St. Augustine renamed to after the Spanish attack no Fort Caroline?

Answer: disfluent


Question: Why were Northern Chinese ranked higher?

Answer:
proper