GMAT Verbal Reasoning Practice Test 7

Question : 19 of 100

Marks: +1, -0

Advertisement: Of the many over-the-counter medications marketed for the relief of sinus headache. Sine Ease costs the least per dose. And Sine Ease is as effective per dose as the most effective of those other medications. So for relief from sinus headaches, Sine Ease is the best buy.
Which of the following, if true, most seriously weakens the argument above?

Most of the over-the-counter medications marketed for the relief of sinus headache are equally effective per dose in providing such relief.
Many of the over-the-counter medications marketed for the relief of sinus headache contain the same active ingredient as Sine Ease.
People who suffer from frequent sinus headaches are strongly advised to consult a doctor before taking any over-the-counter medication.
An over-the-counter medication that is marketed for the relief of symptoms of head cold is identical in composition to Sine Ease but costs less per dose.
The per dose price for any given over-the-counter medication marketed for the relief of sinus headache is higher for smaller packages than it is for larger packages.

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