CR 真题一道,请教

Plant scientists have been able to genetically engineer vegetable seeds to produce crops that are highly resistant to insect damage.Although these seeds currently cost more than conventional seeds, their cost is likely to decline. Moreover, farmers planting them can use far less pesticide, and most consumers prefer vegetables grown with less pesticide, therefore, for crops for which these seeds can be developed,their use is likely to become the norm.

Which of the following would be most useful to know in evaluating the argument above?

Answer is: Whether farmers typically use agriculture pesticides in larger Amounts than is nessary to prevent crop damage?

但是下面这个选项为什么错呢?

Whether seeds genetically engineered to produce insect-resistant crops generate significantly lower per acre crop yields than do currently used seeds?

this choice is wrong b/c it is not the focus of the argument, it is only one of the many factors that can make the two seeds different. Other factors such as better taste, better looking can play some role. however, to the author, the only important factor is just pesticide itself. Hence, your choice is irrelevant.

谢谢2楼的

是不是因为"therefore, for crops for which these seeds can be developed"这句话引起的?就是强调这个test的内容集中在its resistance to insect damage?