The makers of Activite, a natural dietary supplement, claim that it promotes energy and mental alertness. To back up their claim, they offer a month's supply of Activite free to new customers. Clearly, Activite must be effective, since company's interest to make such an offer.
What this question is testing
Your task
Find the choice that makes the argument's conclusion less likely to be true.
Common trap
Answers that look negative but attack a claim the argument never relied on.
Winning move
Find the assumption the argument depends on, then pick the choice that undermines it.
Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.