求问一道陈虎平10套中的 逻辑题思路

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3. Between 1970 and 1980, energy consumption by United States industry peaked and then declined, so that by 1980 total industrial use of energy was below the 1970 level even though total industrial output had grown substantially in the same period. Industry must have instituted highly effective energy conser- vation measures in those years to have achieved such impressive results. Which of the following, if true, most seriously weak- ens the conclusion of the argument? (A) Many industries switched to the greatest extent possible from high-priced oil to lower-priced alternatives throughout the 1970's. (B) Total residential energy consumption was higher in the United States in 1980 than it had been in 1970 (C) Many industrial users of energy had paid little attention to energy conservation prior to 1970. (D) Industrial output grew less rapidly from 1970 to 1980 than it had from 1960 to 1970. (E) The industries whose production dropped sharply during the 1970's included a disproportionately large number of energy-intensive industries. 这道题的 论据是： 能源消耗1970>1980,产量1970<1980 结论：   效率（=产量/能源）1970<1980 这道题答案选E，感觉有一些解释不通呢？这样题，找一个weaken原文的理由，其实就是找一个解释原文的现象，这个解释又推不出结论。 E的推理 指出20世纪70年代中的energy intensive industries产量大幅下降，能量使用也随之下降，但是E并不能解释为什么工业总产量还在上升（有点不完整的感觉），按照E的意思energy intensive industries产量大幅下降，感觉工业总产量要降低的意思. 我的理解是D。 因为  产量本来就是上升的，只是 产量速率1970>1980       这样也能说明效率并没有提高。