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题目材料：
When an old tree was felled, a very thin ring was detected among the oldest rings in the stump. When the width of rings, each corresponding to one year`s growth, was correlated with local rainfall records, it was found, as expected, that thicker rings had occurred in years with abundant rain. Therefore the very thin ring, which dates to 1662, before rainfall records were kept, indicates that a severe drought occurred that year.
Which of the following, if true, most seriously weakens the argument given?
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ATree rings allow for a very precise and reliable way of determining the age of a tree.
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BThe decrease of light in rainy years was not a factor that would have limited the growth of the tree.
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CSome species of trees have methods of storing water between years, and thus the thickness of their rings does not vary with year-to-year rainfall.
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D There is independent evidence to suggest that the local patterns of rainfall changed significantly over the lifetime of the tree.
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ESevere infestations of caterpillars can abruptly reduce the growth of trees.
E显示答案
