Which of the following, if true of Berinia, most help to resolve the apparent discrepancy?

In Berinia, the age at which people could begin to drink alcohol legally used to be 18. In 1990, in an attempt to reduce alcohol consumption and thereby to reduce alcohol-related traffic deaths among Berinians under 21, the legal drinking age was raised to 21. Alcohol-related traffic deaths among people under 21 have decreased significantly since 1990. Nevertheless, surveys show that people in that age-group drink just as much alcohol as they did before 1990.

Which of the following, if true of Berinia, most help to resolve the apparent discrepancy?

A. For the population as a whole, annual alcohol consumption is no lower now than it was in 1990

B. Alcohol consumption away from home, for example in bars and restaurants, is much lower among people under 21 than it was in 1990

C. The proportion of people under 21 who own a car is higher now than it was in 1990

D. Alcohol consumption is lower among people under 21 than among adults in most other age-groups.

E. Alcohol-related traffic deaths among people over 21 have increased slightly since 1990.

A 对总体而言酒的消费量不变。文中只涉及21岁以下的人，与整体无关。B 近年来在酒吧等外边喝酒的21岁以下的人数少于1900年以前的。解释了事故减少，正确。C 21岁以下有汽车的人数比例增加。与文意相反，汽车增加应该导致的是事故增加而不是减少。D 21岁以下人群酒精消费比其他年龄段人群消费量要低。只需要考虑21岁以下的人群，与其他人群比较没有意义。E 21岁以上的酒精相关的交通死亡人数比起1900年前轻微上升。同样未涉及21岁以下人群，无关。

原文：在B地，1900年前的合法喝酒年龄是18岁，之后改为了21岁。现在18-21岁中因喝酒而造成的交通事故数量大幅减少，但是在这个年龄段中酒的消费量与1900年前相比没有变化。
问题：解释这两个矛盾的现象出现原因。
思路：比较对象是21岁以下人群中的交通事故数量减少和酒精消费量不变，因此选项中应当包含事故减少的原因解释或是消费不变的原因解释。

A 对总体而言酒的消费量不变。文中只涉及21岁以下的人，与整体无关。
B 近年来在酒吧等外边喝酒的21岁以下的人数少于1900年以前的。解释了事故减少，正确。
C 21岁以下有汽车的人数比例增加。与文意相反，汽车增加应该导致的是事故增加而不是减少。
D 21岁以下人群酒精消费比其他年龄段人群消费量要低。只需要考虑21岁以下的人群，与其他人群比较没有意义。
E 21岁以上的酒精相关的交通死亡人数比起1900年前轻微上升。同样未涉及21岁以下人群，无关。