March, 1997, section 5, No. 6问题探讨

potato cyst nernatodes are a pest o fpotato crops. the nernatodes can lie dormant for several years in their cyst, which are protective capsules, ad do not emerge except in the presence of chemicals emitted by potato roots. a company that has identified the relevant chemicals is planning to market them to potato farmers to spread on their field s when no potatoes are planted : any nematodes that emerge will soon starve to death.

which of the followng if true, best supports the company's plan:

...

b) the only part of a potato plant that a nematode eats is the roots.

d) trails have shown that spreading even minute quantities of the chemicals n potato fields caused 9/10 of the nematodes present to emerge from the cysts.

official is d) ; but i think b) is even better than d).

d) has some problems: 1. 原文未谈及chemical 效用

2. 即使9/10 害虫出来了, 若1/10 生育力极强, 又奈何之.

反之, b) is a better comsumption to support original idea.

各位以为如何???

另：这里是语法区，逻辑问题请发到逻辑区，谢谢！