Which of the following, if true, would most clearly undermine the conclusion that the author makes based on the 1984 survey? A. Areas south of the Yangtze basin currently have less wild-rice habitat than they once did. B. Surveys since 1984 have shown wild rice populations along the upper Yangtze as well as along the middle and lower Yangtze. C. The populations of wild rice along the Yangtze represent strains of wild rice that migrated to the north relatively recently. D. Early rice-farming societies along the Yangtze were not as highly developed as archaeologists once thought. E. In East Asia, the historical geographic range of wild rice was more extensive than the present-day geographic range is.