medium · GMAT Verbal

Which of the following best identifies a flaw in this argument?

1. Luxury dining is, by any reasonable standard, objectively superior to every other available style of dining in the city.
2. The surveyed patrons are a self-selected group whose tastes and incomes need not represent the city's population at large.
3. The restaurant's owner may have, in some unspecified way, pressured the patrons into giving artificially favorable answers.
4. No survey of any restaurant's own patrons, however carefully conducted, could ever yield genuinely useful information about quality.
5. The patrons gave high ratings only because the restaurant offered them a discount on their next visit in exchange.

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