If the statements above are true, which of the following must also be true on the basis of them?
Average fuel efficiency of domestic cars manufactured after 1988 was better than that of imported cars manufactured before 1988.
Average fuel efficiency of newly manufactured domestic cars has steadily worsened since 1988.
Average fuel efficiency of newly manufactured imported cars has steadily worsened since 1988.
Average fuel efficiency of newly manufactured imported cars has steadily improved since 1983.
Average fuel efficiency of imported cars manufactured in 1983 was better than that of imported cars manufactured in 1988.
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 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?
Many industries switched to the greatest extent possible from high-priced oil to lower-priced alternatives throughout the 1970 s.
Total residential energy consumption was higher in the United States in 1980 than it had been in 1970
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