AB很好排除，这种解释性的一般都用that从句。
E，错到离谱，摘自ron
choice (e) is TOTALLY wrong. if you can't kill choice (e) quickly, you should read through a large number of correct answers to SC questions in the official guides, just for the purpose of internalizing the writing style of the correct answers.
i can't overestimate the importance of becoming comfortable with the writing style of the gmat. in the same way you can classify language as 'shakespearean' or 'faulkner-esque' at a glance, you can also classify language as to whether you might see it on the gmat. once you achieve a certain degree of this familiarity, choice (e) and its ilk will begin to look ridiculous.

the formal reasons why choice (e) is wrong: 1, it uses the passive voice for no good reason whatsoever, and, 2, more importantly, it says only that state laws were being violated; it doesn't at all indicate the crucial fact that the ban violated the state laws. that's baaaaaadd bad bad.

剩下CD，法律的属性一般都用现在分词，避免了「过去/未来」之类的允许问题。