关于OG17 652逻辑分类

Donquioxte

原文：
the irradiation kills bacteria and thus retards spoilage. However, it also lowers the nutritional value  of many foods. For example,irradiation destorys a significant percentage of whatever vitamin B1 a food may contain.Proponents of irradiation point out that irradiation is no worse in this respect than cooking.However,this fact is misleading,since_
正确选项是E for food that is both irradiated and cooked, the reduction of Vitamin B1 associated with either process individually is compounded.
即两者加在一起比单个过程减少的B1都多，但是这题根据Helr 的逻辑分类我感觉像是类比（这题我自己也分不清楚）
类比只要证明两者不同就可以削弱这个论证，这一点选项C 比较了两者的不同，cooking is usually the final step in ……，whereas irradiation serves to ……
虽然不明但觉得有道理

求大神帮忙分类，，，并帮我解析一下