求助GRE36套EX6的第11题~

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这道题直接搞不懂哇~The historian Frederick J. Turner wrote in the 1890‘s
that the agrarian discontent that had been developing
steadily in the United States since about 1870 had been   
Line precipitated by the closing of the internal frontier--that is,   
5  the depletion of available new land needed for further
expansion of the American farming system. Actually,
however, new lands were taken up for farming in the
United States throughout and beyond the nineteenth
century. The emphasis of the presumed disappearance of   
10  the American frontier obscured the great importance of
changes in the conditions and consequences of
international trade that occurred during the second half of
the nineteenth century. Huge tracts of land were being
settled and farmed in Argentina, Australia, Canada, and in   
15  the American West, and these areas were joined with one
another and with the countries of Europe into an
interdependent market system. Consequently, agrarian
depressions no longer were local or national in scope, and
they struck several nations whose internal frontiers had   
20  not vanished or were not about to vanish. Between the
early 1870‘s and the 1890‘s, the mounting agrarian
discontent in America paralleled the almost uninterrupted
decline in the prices of American agricultural products on
foreign markets.   



11. The author‘s argument implies that, compared   
    to the yearly price changes that actually   
    occurred on foreign agricultural markets during   
the 1880‘s, American farmers would have most   
preferred yearly price changes that were
   (A) much smaller and in the same direction
   (B) much smaller but in the opposite direction
   (C) slightly smaller and in the same direction
   (D) similar in size but in the opposite direction   
   (E) slightly greater and in the same direction