Until mow,only injectable vaccines against influenza have been available.  arents are reluctant to subject children tothe pain of injections, but adults, who are at risk of serious complicationsfrom influenza, are commonly vaccinated. A new influenza vaccine, administered painlessly in a nasal spray, is effectivefor children. However, since childrenseldom develop serious complications from influenza, no significant publichealth benefit would result from widespread vaccination of childrenusing the nasal spray. Which ofthe following is an assumption on which the argument depends? A. Any person who has received the injectablevaccine can safely receive the nasal-spray vaccine as well. B. The new vaccine uses the same mechanism toward off influenza as jnjectable vaccines do. C. The injectable vaccine is affordable for alladults. D. Adults do not contract influenza primarilyfrom children who have influenza. E. The nasal spray vaccine is mot effectivewhen administered to adults. 看不太懂。。。求解释,求翻译,多谢