GRE Reading Comprehension: PPO-GRE阅读PPO - 86W151133ACQ46NGR

Which of the following, if true, would strengthen the argument that climate change was involved in the disappearance of certain pika populations? A. Outside the Great Basin, many pika populations are dwindling. B. Some plants that used to be part of pika habitats at lower elevations are now found only at higher elevations. C. Certain other animal populations in the Great Basin region have actually experienced modest increases in numbers.