Several companies that make herbal teas containing ginseng assert in their marketing that ginseng counteracts the effects of stress. As a result, many people buy these products hoping to improve their health. Yet no definitive scientific study links ginseng with the relief of stress. Thus, these marketing campaigns make false claims. The reasoning in the argument is flawed in that the argument ['concludes that a claim is false merely on the grounds that it has not been shown to be true', 'fails to address the possibility that some ingredients other than ginseng in the herbal teas containing ginseng counteract the effects of stress', "rejects an argument because of its source without evaluating the argument's logical strength", 'fails to address the possibility that many people buy herbal teas containing ginseng because they enjoy drinking the tea']