Question ID:PT74 S4 Q24 Passage: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 otherwise it would not be in the company's interest to make such an offer. Stem:Which one of the following, if true, most weakens the argument?  Correct Answer Choice:DChoice A:The nutrients in Activite can all be obtained from a sufficiently varied and well-balanced diet.  Choice B:There are less expensive dietary supplements on the market that are just as effective as Activite.  Choice C:A month is not a sufficient length of time for most dietary supplements to be fully effective.  Choice D:The makers of Activite charge a handling fee that is considerably more than what it costs them to pack and ship their product.  Choice E:The mere fact that a dietary supplement contains only natural ingredients does not insure that it has no harmful side effects.