不理解这道题，大N们帮帮忙！！！

Amy1989618

A recent survey of all auto accident victims in Dole County found that, of the severely injured drivers and front-seat passengers, 80 percent were not wearing seat belts at the time of their accidents. This indicates that, by wearing seat belts, drivers and front-seat passengers can greatly reduce their risk of being severely injured if they are in an auto accident.
The conclusion above is not properly drawn unless which of the following is true? E
(A) Of all the drivers and front-seat passengers in the survey, more than 20 percent were wearing seat belts at the time of their accidents.
(B) Considerably more than 20 percent of drivers and front-seat passengers in Dole County always wear seat belts when traveling by car.
(C) More drivers and front-seat passengers in the survey than rear-seat passengers were very severely injured.
(D) More than half of the drivers and front-seat passengers in the survey were not wearing seat belts at the time of their accidents.
(E) Most of the auto accidents reported to police in Dole County do not involve any serious injury.

Amy1989618

我也选的E.但是答案是A啊。。。

charles1992

我也选E。

前提：一份最近的汽车事故中的受害者的调研表明，受重伤的司机和前排乘客中的80%不系安全带。
结论：如果司机和前排乘客系安全带的话，可大幅减少受重伤的风险。
问哪个选项为使结论正确的前提？
E取非，表明是司机和前排乘客受重伤是因为严重的交通事故本身，而非不系安全带造成的，即排除他因。bingo...