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The author's arguments about the problems with American discount airlines would be most weakened if which of the following were discovered to be true?
This information strengthens the author's proposition that Europeans prefer to fly cheaply.
The author believes that Americans are most concerned with service; the airline in this answer choice succeeded by offering better service, so it strengthens the author's theory.
We know that Americans and Europeans have different preferences in their airlines, so it is logical that European airlines would have to change their policies when serving an American market. This answer choice strengthens the author's theory.
This answer choice strengthens the author's theory that Europeans prefer cheap flights to good customer service.
If American and European preferences are becoming more similar, the author's idea that Americans and Europeans prefer different amenities while flying is weakened.