Gortland has long been narrowly self-sufficient in both grain and meat.However, as per capita income in Gortland has risen toward the world average, per capita consumption of meat has also risen toward the world average, and it takes several pounds of grain to produce one pound of meat. Therefore, since per capita income continues to rise, whereas domestic grain production will not increase, Gortland will soon have to import either grain or meat or both.
Which of the following is an assumption on which the argument depends?
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AThe total acreage devoted to grain production in Gortland will not decrease substantially.
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BThe population of Gortland has remained relatively constant during the country's years of growing prosperity.
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CThe per capita consumption of meat in Gortland is roughly the same across all income levels.
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DIn Gortland, neither meat nor grain is subject to government price controls.
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EPeople in Gortland who increase their consumption of meat will not radically decrease their consumption of grain.
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正确答案: E