Over the last century, paleontologists have used small differences between fossil specimens to classify triceratops into sixteen species. This classification is unjustified, however, since the specimens used to distinguish eleven of the species come from animals that lived in the same area at the same time.
Which of the following, if true, would enable the conclusion of the argument to be properly drawn?
(A) Not every species that lived in a given area is preserved as a fossil.
(B) At least one individual of every true species of triceratops has been discovered as a fossil specimen.
(C) No geographical area ever supports more than three similar species at the same time.
(D) In many species, individuals display quite marked variation.
(E) Differences between fossil specimens of triceratops that came from the same area are no less distinctive than differences between specimens that came from different areas.
觉得题干看的优点问题，请大家帮帮我，谢谢！
答案是C
我的理解大概是这样的，如果不充分请指正。
这个题目是assumption,就是没有这个前提，文中的结论（This classification is unjustified）就不能成立。
前面paleontologists说有sixteen species，但是文中说eleven of the species come from animals that lived in the same area at the same time怎么有证明这个16个种类不对了呢，就需要C拉，No geographical area ever supports more than three similar species at the same time。
取非又削弱
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