medium · GRE Verbal

An advertisement states that a supplement 'must work' because it is the top-selling product in its category, with repeat purchases from thousands of customers each month. The advertisement offers no measurement of the supplement's effect, only its sales figures. Which statement can be properly inferred from the passage?

  1. Sales figures alone do not establish that the supplement produces its advertised effect
  2. The supplement is the most effective product available in its category among every competing brand sold anywhere in the same product category
  3. Every customer who repurchases the supplement has verified that it works
  4. No supplement with lower sales could possibly be more effective
  5. The advertisement includes clinical measurements that support its claim

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