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(See the complete passage discussion here: lsat/viewtopic.php?t=14217)
The correct answer choice is (C)
This question asks for the likely outcome if the aggressive disease organisms discussed on line 46
were eliminated from land that had been in constant agricultural use. Such disease, researchers
concluded, were the reason that seeds in overfarmed plots did not do as well as those growing in land
that had been out of production for two decades. Presumably, if such disease were to be eliminated,
the seeds would do better, perhaps as well as those growing naturally nearby.
Answer choice (A): There is no basis to conclude that beneficial microorganisms would decline if
the disease organisms were eliminated.
Answer choice (B): The elimination of the disease organisms would not render unwanted species
unable to survive, so this is not the right answer choice.
Answer choice (C): This is the correct answer choice. As discussed, such seeds would likely do
better if the harmful aggressive disease organisms could be eliminated; the native plant would have a
better chance of survival.
Answer choice (D): Nothing in the passage suggests that the elimination of disease organisms in
over-farmed land would result in a long-term increase in the number of beneficial microorganisms.
Answer choice (E): The author does not suggest that eliminating disease microorganisms would be
likely to result in proportional increases in the population of other disease organisms, so this cannot
be the right answer to this Must Be True question.