Wild cheetahs live in the African grasslands. Previous estimates of the size that the wild cheetah population must be in order for these animals to survive a natural disaster in the African grasslands region were too small, and the current population barely meets the previous estimates. At present, however, there is not enough African grassland to support a wild cheetah population larger than the current population. The statements above, if true, most strongly support which one of the following conclusions? ['The principal threat to the endangered wild cheetah population is neither pollution nor hunting, but a natural disaster.', 'Previous estimates of the size of the existing wild cheetah population were inaccurate.', "The cheetah's natural habitat is decreasing in size at a faster rate than is the size of the wild cheetah population.", 'In the short term, the wild cheetah population will be incapable of surviving a natural disaster in the African grasslands.']