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题目材料:

Which of the following, if true, most strongly supports the scientist`s conclusion?

  • AVolcanoes massive enough to generate high concentrations of iridium are very rare.

  • BMassive volcanic eruptions occurred frequently 80 million years ago.

  • CMost scientists support the hypothesis that a cosmic impact wiped out the dinosaurs.

  • DThe massive extinction that occurred 70 million years ago killed not only the dinosaurs but also 70 percent of all life on Earth.

  • EA comet struck the earth some 120 million years ago, but no widespread extinction occurred.

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