
Passage: About 12,000 years ago, when the climate warmed, humans began to come to all parts of North America. During the same period, large mammals, such as mastodons, mammoths, and saber-toothed tiger, became extinct from their once widespread North American lands. So, contrary to the myth that humans once coexisted peacefully with other creatures in nature, human activity caused the extinction of these animals as early as 12,000 years ago.
Question: Which of the following statements is most likely to be challenged by the above argument?
A. A.The argument unreflectively excludes humans from nature.
B. B.The arrival of humans in North America may have led to the extinction of other animals besides mastodons, mammoths and saber-toothed tiger.
C. C.The extinction of large mammals such as mastodons, mammoths and saber-toothed tiger was of extraordinary significance to the hominids of early North America.
D. D.The evidence presented applies equally to both alternative hypotheses: Climate change caused the extinction of large mammals, the same reasons that brought humans to all parts of North America.
Answer: