Which of the following can be inferred from the passage about the "southern-origin theory?" A. The theory is based on an unconventional understanding of how hunter-gatherers first developed rice agriculture. B. The theory fails to take into account the apparent fact that evidence for the first stage of rice cultivation in the north is missing. C. The theory was developed primarily in response to a 1984 survey of wild rice's geographic range. D. Reassessment of the dates of some archaeological evidence has undermined support for the theory. E. Evidence of sophisticated rice-farming societies in the Yangtze region provides support for the theory.