Statistic over four consecutive years showed that four percent more automobile accidents happened in California during the week following the switch to daylight saving time and during the week following the switch back to standard time than occurred the week before each event.These statistics show that these time changes adversely affect the alertness of California drivers.

The conclusion in the argument above is based on which of the following assumptions?

(D)There are no other factors such as school vacations or holiday celebrations that cause accident rates to rise during these weeks.(正确答案)

(E)A time change at any other time of year would not produce a similar increase in accident rates.(书上的理解是说明不是时间变化导致事故增加,因为由于其他任何时候的变化都不导致事故增加那么提到的两种变化也不应导致事故增加)

我的疑问是E为什么错呢?如果理解为"其他任何时间变化都不引发,而恰恰就在题干中说的两种时间变化时发生"那不就说明正是这两种时间变化导致事故的增加吗?

我实在有些想不通,还请大家帮帮忙啊,先谢过各位了。

我觉得E是conclusion而不是assumption.

而D是排除它因的assumption.

thanks ~!!!