i picked c and it is wrong...
Of the countries that were the world's twenty largest exporters in 1953, four had the same share of total world exports in 1984 as in 1953. Theses countries can therefore serve as models for those countries that wish to keep their share of the global export trade stable over the years.
  Which of the following, if true, casts the most serious doubt on the suitability of those four countries as models in the sense described?
  (A) Many countries wish to increase their share of world export trade, not just keep it stable.
  (B) Many countries are less concerned with exports alone than with he balance between exports and imports.
  (C) With respect to the mix of products each exports, the four countries are very different from each other.
  (D) Of the four countries, two had a much larger, and two had a much smaller, share of total world exports in 1970 than in 1984.
  (E) The exports of the four countries range from 15 percent to 75 percent of the total national output.
oa d
Country exports
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The passage suggests that those four countries kept their market share for the entire time between 1953-1984. If this is untrue and of them experienced a major dip in their share, why would you want to emulate them?