Astronomers have long believed that the universe was over 15 billion years old. This information was based on theories that estimated the ages of very large, old stars. New data, however, has forced this age to be revised. Recent observations suggest that stars age much more quickly than was previously thought. Current estimates put the age of the universe at just over 13 billion years.
Which of the following best describes the function of the bolded sentence in the argument above?
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AIt refutes one of the assumptions underlying the old age estimates.
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BIt attacks the credibility of scientists who argued the universe was over 15 billion years old.
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CIt suggests that more observations may further refine estimates of the universe's age.
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DIt claims that further refinement of the age of the universe will yield progressively younger estimates.
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EIt suggests that sloppy observation techniques resulted in the bad estimates of the universe's age.
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正确答案: A