The country of Baurisia has, until now, been self-sufficient in both grain and meat. However, with growing prosperity in Baurisia has come a steadily increasing per capita consumption of meat, and it takes several pounds of grain to produce one pound of meat. Therefore, since per capita income in Baurisia is almost certain to rise further but increases in domestic grain production are highly unlikely, Baurisia is soon likely to become an importer of grain.

Which of the following, if true, most seriously weakens the argument?


When people increase their consumption of meat, they also tend to increase their consumption of grain.

The per capita consumption of meat in Baurisia is roughly the same across all income levels.

Per capita consumption of meat has not increased substantially in recent years in those countries from which Baurisia is likely to import meat.

It is more economical for Baurisians to import meat than grain.

During Baurisia's years of growing prosperity, the country's population has remained relatively stable.

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情景：从前Baurisia是可以自给自足的，但是现在生活水平提高了，人们越来越愿意吃肉，一磅的肉需要花好几榜个谷物来生产，由于谷物的收成没有提升，所以Baurisia很快就得进口谷物了。

推理：

前提：Baurisia的人均收入上升并且越来越喜欢吃肉，并且谷物的产量不会上升
结论：Baurisia很快就要进口谷物了


选项分析：

A选项：当人们对于肉的需求增长时，同时也会对于谷物的有更多的需求。若人们对肉的需求上升而对谷物的需求下降，那么Baurisia不一定需要进口谷物。本选项对其取非，所以可以加强推理文段。

B选项：对于所有的收入阶层，大家对于肉类的需求都相差无几。本选项只描述了所有人对肉需求是否相同，并不能反驳要进口谷物这个结论，可以排除。

C选项：那些可能向Baurisia出口肉类的国家肉类人均消耗量没有增加。本选项没有描述Baurisia的情况，不能反驳结论，可以排除。

D选项：Correct. Baurisia直接进口肉类比较进口谷物划算。若直接进口肉类更划算，那么就算人均的肉消耗量上升，Baurisia也没有必要进口谷物，直接进口肉类就好，所以本选项可以反驳结论。

E选项：在Baurisia变得繁荣的这些年，其人口数量维持稳定。若Baurisia人口数量变少，那么就算人均肉类需求量增加，Baurisia总的肉类需求量也不一定增加，因此Baurisia就不一定需要进口谷物来弥补肉类的不足了。本选项将其取非，可以加强推理文段。

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