题目选项分析

Several recent studies have shown that when alcohol is consumed before driving, the incidence of automobile accidents increases significantly. On this basis, the federal government has passed strict laws prohibiting drivers from operating their vehicles after consuming specific amounts of alcohol. Surprisingly, it has since been discovered that a large number of drivers who have not been consuming alcohol in amounts that exceed the legal specifications are still becoming involved in the type of automobile accidents that the laws were designed to reduce.

Which one of the following, if true, could by itself adequately explain the unexpected finding reported in the passage?

【选项】People are more likely to make automobile trips under the influence of alcohol than they were before the introduction of the laws.