问一道逻辑啊 ，居然有三种答案 ，我晕乎了，求解啊！

cxn仔

Scientists have made genetic modifications to cotton to increase its resistance to insect pests. According to farmers’ report, the amount of insecticide needed per acre to control insect pests was only slightly lower for those who tried the modified seed than for those who did not. Therefore, since the modified seed costs more than ordinary seed without producing yields of higher market value, switching to the modified seed would be unlikely to benefit most cotton farmers economically.



Which of the following would it be most useful to know in order to evaluate the argument?

(B.E爭議題,答案是B我覺得不對)

1. Whether farmers who tried the modified cotton seed had ever tried growing other crops from genetically modified seed.[C1]
   
   
2. Whether the insecticides typically used on ordinary cotton tend to be more expensive than insecticides typically used on other crops.[C2]
   
   
3. Whether for most farms who grow cotton it is their primary crop
   
   
4. Whether the farmers who have tried the modified seed planted as many acres of cotton, on average, as farmers using the ordinary seed did.
   
   
5. [C3][C3]
   Whether most of the farmers who tried the modified seed did so because they had previously had to use exceptionally large quantities of insecticide.[C4]
   

[C1]irrelevant



[C2]跟other crops做比較不可能對的.如果other crops改成modified seeds就對.



[C3]irrelevant



[C4]Correct. 注意exceptionally,若這個問題的答案是yes,則農夫因為過去用的農藥量是exceptionally large,所以即使slightly省一點農藥還是benefit的,反之若不是,則就符合結論.

这个是verbal详解里面的 ，但是我做套题那上面的答案又是D， 所以这题是BDE纠结 请问应该选哪个啊？

sdcar2010

BBBBBBBBB

The amount of the pesticide does not tell you about the cost thereof!!!

I bouth 3 shoes, the same number as you. But I bought 3 Nike and you bought 3 Li-ning!