GRE Reading Comprehension: Maggoosh-GRE阅读Maggoosh - 0FDUMW5OXYLC5Y5BM

Which of the following is an assumption the author of the passage makes? A. The crops displaced by the flooding of the Coatzacoalcos River would not be viable if replanted in areas unaffected by flooding. B. Adapting crop subsistence involves some level of central governance. C. Feuding clans are not capable of sustaining a viable population in the wake of ecological catastrophe.