Several companies that make herbal teas containing ginseng assert in their ... ...

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
(A) rejects an argument because of its source without evaluating the argument’s logical strength
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Dec 2012 LSAT (PT68): Logical Reasoning A