求解，这道题，很有难度？

koyikoyi

Plantings of cotton bioenginineered to produce its own insecticide against bollworms,a major cause of crop failure,sustained little bollworm damage until this year.This year the plantings are being seriously damaged by bollworms.Bollworms,however,are not necessarily developing resistance to the cotton's insecticede.Bollworms breed on corn,and last year more corn than usual was planted throughout cotton-frowing regions.So it is likely that the cotton is simply being overwhelmed by corn-bred bollworms
In evaluating the argument,which of the followin gwould it be most useful to establish?
(A)Whether corn could be bioengineered to produce the insecticide
(B)Whether plantings of cotton that does not produce the insecticide are suffering unusually extensive damage from bollworms this year
(C)Whether orher crops that have been bioengineered to produce their own insecticide successfully resist the pests against which the insecticide was to protect them
(D)Whether plantings fo bioengineered cotton are frequently damaged by insect pests orher than bollworms
(E)Whether there are insecticides that can be used against bollworms that have developed resistance to the insecticede produced by the bioengineered cotton