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?

Correct answer marked below

Many countries wish to increase their share of world export trade, not just keep it stable.\n

Many countries are less concerned with exports alone than with the balance between exports and imports.

With respect to the mix of products each exports, the four countries are very different from each other.

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.

Correct

The exports of the four countries range from 15 percent to 75 percent of the total national output.

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What this question tests

Whether you can identify the unstated assumption a critical-reasoning argument depends on.

Picking an option that strengthens the argument or is merely relevant instead of one that is required.