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Archaeologist: For 2,000 years the ancient Sumerians depended on irrigation ... ...

Archaeologist: For 2,000 years the ancient Sumerians depended on irrigation to sustain the agriculture that fed their civilization. But eventually irrigation built up in the soil toxic levels of the salts and other impurities left behind when water evaporates. When its soil became unable to support agriculture, Sumerian civilization collapsed. A similar fate is thus likely to befall modern civilizations that continue to rely heavily on irrigation for agriculture.

Which one of the following, if true, most weakens the archaeologist’s argument?

(A) Most modern civilizations could not feed themselves through agriculture without relying heavily on irrigation.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in PT72 (Jun 2014): Logical Reasoning A

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