GRE 里一道逻辑题,请赐教!

题目

GRE 里一道逻辑题,请赐教!
Editorial:
Critics of nuclear power complain about the allegedly serious harm that might result from continued operation of existing nuclear power plants. But such concerns do not justify closing these plants;after all, their operation has caused no more harm than that caused by pollution generated by coal-and oil-burning power plants, the most important other sources of energy.
Which of the following is an assumption on which the argument depends?
(A) Existing nuclear power plants should be closed only if it can be conclusively demonstrated that their continued operation is likely to cause harm more serious than the harm their operation has already caused.
(B) Closing existing nuclear power plants would require greatly increased reliance on coal-and oil-burning power plants.
(C) The harm that has resulted from operation of existing coal-and oil-burning power plants has been significant.
(D) The harm that a nuclear power plant is likely to ca

答案

原题：结论：核电站的批评者抱怨现有的核电站连续工作的后果可能很严重.但是其担心不足以关闭核电站.原因：因为毕竟核电站运行的害处并未曾比煤矿、石油电站这些更重要的能源工业所产生的污染更严重.（注意原文中的...