Explanation
Reading the question: The question stem asks for an
assumption. The conclusion is the last sentence. The critical piece of evidence
is the preceding sentence; the prior sentences are primarily intro. Paisi has extra legumes to sell; that seems like a good
reason why they could export them. Secondarily, the fact that soybeans are in
decline is given as a reason. That connection is weaker: is the competition in
non-legumes as strong as it is in soybeans? If it is, the argument has a big
problem. We'll look for that.
Applying the filter: None of the answer choices address
whether the competition in non-legumes as strong as it is in soybeans, but (D)
is similar.
Logical proof: We try negating (D): say the quantity of
non-soy legumes in other countries was decreasing. Say the amount imported by
them was zero! That would destroy the argument. Hence, (D) pertains to a
critical assumption and is the correct answer. The correct answer is (D).
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