Crops can be traded on the futures market before they are harvested. If a poor corn harvest is predicted, prices of corn futures rise; if a bountiful corn harvest is predicted, prices of corn futures fall. This morning meteorologists are predicting much-needed rain for the corn-growing region starting tomorrow. Therefore, since adequate moisture is essential for the current crop's survival, prices of corn futures will fall sharply today.
Which of the following, if true, most weakens the argument above?
Corn that does not receive adequate moisture during its critical pollination stage will not produce a bountiful harvest.
Futures prices for corn have been fluctuating more dramatically this season than last season.
The rain that meteorologists predicted for tomorrow is expected to extend well beyond the corn-growing region.
Agriculture experts announced today that a disease that has devastated some of the corn crop will spread widely before the end of the growing season.
Most people who trade in corn futures rarely take physical possession of the corn they trade.
P: 天气预报明天开始会有降雨,降雨对于当前作物的生长是必要的。-> C: corn的价格会下降
choice a, 没有收到足够雨水的作物将无法产出丰盛的收成-> irrelevant, 就是原文的premise换一种说法
choice b, 这一季的作物价格浮动得比上一季的作物价格更厉害-> irrelevant,
choice d, 一个已经毁了玉米作物的疾病很快就会在种植季之前蔓延-> correct, 雨水产生好收成,疾病破坏收成
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