发一道逻辑题 og 请教大家

mnmicy

Gortland has long been narrowly self-suffi cient 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?
(A) The total acreage devoted to grain production in
Gortland will not decrease substantially.
(B) The population of Gortland has remained
relatively constant during the country’s years of
growing prosperity.
(C) The per capita consumption of meat in Gortland
is roughly the same across all income levels.
(D) In Gortland, neither meat nor grain is subject to
government price controls.
(E) People in Gortland who increase their
consumption of meat will not radically decrease
their consumption of grain.



没有看懂E选项  谁能帮着解释一下   万分感谢