og12 cr 99求解释！！！

og12 cr99题没有明白题目解释啊，为什么说cooking和radiation一起能减少更多的VB1就是削弱了原题啊？为什么选E啊?
99. Which of the following most logically completes theargument?

The irradiation of food kills bacteria and thus retardsspoilage. However, it also lowers the nutritional valueof many foods. For example, irradiation destroys asignificant percentage of whatever vitamin B1 a foodmay contain. Proponents of irradiation point out thatirradiation is no worse in this respect than cooking
.However, this fact is either beside the point, sincemuch irradiated food is eaten raw, or else misleading,since .
(Amany of the proponents of irradiation are fooddistributors who gain from foods’ having alonger shelf life

(B) it is clear that killing bacteria that may bepresent on food is not the only effect that

irradiation has

(C]cooking is usually the final step in preparing foodfor consumption, whereas irradiation serves toensure a longer shelf life for perishable foods

(D) certain kinds of cooking are, in fact, even moredestructive of vitamin B1 than carefullycontrolled irradiation is

(E)for food that is both irradiated and cooked, thereduction of vitamin B1 associated with eitherprocess individually is compoundedE