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?

(A) Corn that does not receive adequate moisture during its critical pollination stage will not produce a bountiful harvest.
(B) Futures prices for corn have been fluctuating more dramatically this season than last season.
(C) The rain that meteorologists predicted for tomorrow is expected to extend well beyond the corn-growing region.
(D) 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.
(E) Most people who trade in corn futures rarely take physical possession of the corn they trade.

I shortlisted choice C and D. Correct Answer D

Now Lets Play.
Poor corn = price rise
Bountiful corn = Price fall
Effect of News = corn crop will flourish
Conclusion = Price will fall today
scenario that might weaken the conclusion = their must another news to come which would tell that crops are not gonna flourish despite rain.
Choice D = crop will not flourish despite rain.
Choice C = crop will not flourish because of lack of rain.

I want to know Is Choice C wrong because it is refuting the premise? or there any other reason behind it.
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Please Read this before Posting your question rules-for-posting-in-verbal-gmat-forum-134642.html#p1097623

When it rains, All birds occupy shelters. But Eagle is the only bird that avoids the rain by flying above the clouds.
Problems common to all. Attitude makes the difference

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Oh! I am sorry. I was unaware about the rules. In fact i just read them for the first time.
_________________

Please Read this before Posting your question rules-for-posting-in-verbal-gmat-forum-134642.html#p1097623

When it rains, All birds occupy shelters. But Eagle is the only bird that avoids the rain by flying above the clouds.
Problems common to all. Attitude makes the difference

Concept Initiator Articles
co-ordinate-geometry-simplified-149570.html
time-speed-and-distance-simplified-150163.html
permutations-and-combinations-simplified-150835.html
NEW!!UPCOMING in Simplification Series - INEQUATIONS (Inequalities).

this is proposal passage
do x then Y happen
if rain is good, the crop is good and price falls.

prethink
-assumption is that there is no bad agent
- weakener, there is some bad agent
go to answer choices, look for bad agent.
- D is bad agent.