求助～一道GWD！

dishcai

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?

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

NN们帮帮我～先谢过了！

myheart2008

第4个，只有这个还沾边

TonyGe

第5个正确。statistics is enough to support the claim

dishcai

楼上的答案怎么不一样呢～继续请教！