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题目材料：
In the Lake Ontario food chain, small fish called alewives are prey for predator fish such as salmon. Any successful effort to reduce pollution in Lake Ontario will also result in a reduced alewife population, but reductions of that population will not, as some have feared, lead to smaller populations of salmon in Lake Ontario, since________.
Which of the following most logically completes the argument?
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A.salmon cannot readily compensate for reduced numbers of alewives by finding other prey.
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B.lower pollution in Lake Ontario is unlikely to eliminate alewives from the lake entirely.
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C.the impact of pollution reduction on the population of other fish on which salmon prey in Lake Ontario will be similar to the impact it will have on alewives
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D.changes in the size of a prey population sometimes cause substantial erratic fluctuations in the populations of the prey and their predators
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E.alewives are a principal predator of baby salmon.
E显示答案
