Which of the following, if true, most seriously weakens the argument above? A. The dinnerware is produced exclusively for sale outside Ganandia. B. Ganandian foods typically are much more acidic than foods anywhere else in the world. C. The only source of lead poisoning in Ganandia is lead that has leached into food. D. Most people who use the dinnerware are not aware that it contains lead. E. Acidic foods can leach lead from dinnerware even if that dinnerware has a protective coating.