easy · GRE Verbal

After a café opened one hour earlier, morning sales rose. The owner concludes that the earlier opening caused the rise.

The answer to which question would be most useful for evaluating the conclusion?

  1. How much did the additional hour cost the café?
  2. Who approved the café’s revised opening schedule?
  3. Where did the café display its new business hours?
  4. Did nearby morning foot traffic rise for an unrelated reason?
  5. How long had the café served breakfast at its former opening time?

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