已解答cxd书上的 support谢谢

Caterpillars of all species produce an identical hormone called "juvenile hormone" that maintains feeding behavior. Only when a caterpillar has grown to the right size for pupation to take place does a special enzyme halt the production of juvenile hormone. This enzyme can be synthesized and will, on being ingested by immature caterpillars, kill them by stopping them from feeding.
 

Which of the following, if true, most strongly supports the view that it would not be advisable to try to eradicate agricultural pests that go through a caterpillar stage by spraying croplands with the enzyme mentioned above?
(A) Most species of caterpillar are subject to some natural predation.
(B) Many agricultural pests do not go through a caterpillar stage.
(C) Many agriculturally beneficial insects go through a caterpillar stage.
(D) Since caterpillars of different species emerge at different times, several sprayings would be necessary.
(E) Although the enzyme has been synthesized in the laboratory, no large-scale production facilities exist as yet.

目的通过撒药杀死害虫 哪个不可行?

e不可行呀药不能大量造.很清晰么

c可能杀死益虫(跟杀害虫没关系 一起死么)

为什么答案是c不是e呢 搞不懂

哦 还真是 advisable可取的;适当的;明智的

问题出在对英语理解上，看来还要加强单词阅读呀

谢谢