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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 conservation measures in those years to have achieved such impressive results
Which of the following, if true, most seriously weakens the conclusion of the argument
(A) Many industries switched to the greatest extent possible from high-priced oil to lower-priced alternatives throughout the 1970s
(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