百思不得其解

A recent survey of all auto accident victims in Dole Country found that, of the severely injured drivers and front-seat passengers, 80% 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 ruduce their risk of being severly injured if they are in an auto accident.

The conclusion above is not properly drawn unless which of the following is true?

A. Of all the drivers and front-seat passengers in the survey, more than 20% were wearing seat belts at the time of their accidents.

B. Considerably more than 20% of drivers and front-seat passengers in Dole Country 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 Country do not involve any serious injury.

正确答案：A。

解释中说转换成数学思维。转换的我有点晕乎乎的，请教各位高手，这道题详细的数学思维的解题过程。非常感谢！ 

比如你有10个男朋友 其中3个理科生，7个文科生。

其中有5个人送过花给你，1个理科生，4个文科生。你会觉得文科生真浪漫，70%是文科生，但是80%都是文科生都会送花。

比如你有10个男朋友 其中1个理科生，9个文科生。

其中有5个人送过花给你，1个理科生，4个文科生。你会觉得文科生真不浪漫，90%是文科生，却只有80%的文科生会送花。

上面的太复杂了，给你说个简单的吧

昨天我给你10块钱，今天给你9块钱，你嫌少。我昨天给你10块钱，今天给你11块钱，你就觉得钱多了。

今天你有多少钱不能凭空感觉，要有比较。

题目中就是把 出事的人 跟 所有驾车者 比，才能看出来 不系安全带是好事还是坏事

谢谢，你太有才了！例子举得这么精僻！