[求助]OG11-14,即OG10-14

看了很多原来的帖子，但还是不明白，还望大牛们能指教啊

Opponents of laws that require automobile drivers and passengers to wear seat belts argue that in a free society people have the right to take risks as long as the people do not harm other as a result of taking the risks .As a result ,they conclude that it should be each person's decision whether or not to wear a seat belt .
which of the following ,if true ,nost seriously weakens the conclusion drawn above ?
A many new cars are built with seat belts that automatically fasten when someone sits in the front seat .
B automobile insurance rates for all automobile owners are higher because of the need ot pay for the increased injuries of deaths of people not wearing seat belts .
C passagers in airplanes are required to wear seat belts during takeoffs and landings .
D the rate of automobile fatalities in states that do not have mandatory seat belt laws os greater than the rate of fatalities in states that do have such laws
E in autonobile accidents ,a great number of passengers who do not wear seat belts are injured that are passengers who do wear seat belts .

正确选项选b我倒是能理解，但关键是我觉得     in a free society people have the right to take risks as long as the people do not harm other as a result of taking the risks    这句话本身含有一个A->B的逻辑关系，但我刚开始动手CR，不知道这种题如何通过这种逻辑关系来削弱和加强，希望各位能知道啊

人们有冒险的权利，基于什么基础上呢？ 就是不伤害他人权利。即冒险的必要条件

结论： 人们有不系安全带的权利（一种冒险)

既然是冒险，就应该满足必要条件：不伤害他人权利。

答案的weaken就指出：不系安全带伤害了他人的权利，是结论削弱

很详细的解释  谢谢哈