116. Laws requiring the use of headlights during daylight hours can prevent automobile collisions. However, since daylight visibility is worse in countries farther from the equator, any such laws would obviously be more effective in preventing collisions in those countries. In fact, the only countries that actually have such laws are farther from the equator than is the continental United States.

Which of the following conclusions could be most properly drawn from the information given above?

(A) Drivers in the continental United States who used their headlines during the day would be just as likely to become involved in a collision as would drivers who did not use their headlights.

(B) In many countries that are farther from the equator than is the continental United States poor daylight visibility is the single most important factor in automobile collisions.

(C) The proportion of automobile collisions that occur in the daytime is greater in the continental United States than in the countries that have daytime headlight laws.

(D) Fewer automobile collisions probably occur each year in countries that have daytime headlight laws than occur within the continental United States.

(E) Daytime headlight laws would probably do less to prevent automobile collisions in the continental United States than they do in the countries that have the laws.

 E选项确实没什么异议，是正确的，但是C选项为什么不对呢？

我的分析是，离赤道越远的国家LAW越有效，而现在拥有LAW的国家比美国离赤道要远，那就说明law在美国比较没有效，而effective换言之就是发生车祸的几率低，那么在美国发生车祸的机率就比在有law的国家要大。那么C就看似是对的啊

C 的错误是比较了和题目无关的东东，把两个国家的事故率放在一起比了，而

author真正想比较的是the effect of daytime headlight law.并不能因为

countries that have daytime headlight laws就推导出他们的proportion of

collisions就少过 US 了，事故的起因是有很多可能的，能见度只是其中之一。
只能说他们用daytime headlight的效果要好过 US， 也就是 E。