Newspaper editor: Law enforcement experts - Assumption ?

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Newspaper editor: Law enforcement experts, as well as most citizens, have finally come to recognize that legal prohibitions against gambling all share a common flaw: no matter how diligent the effort, the laws are impossible to enforce. Ethical qualms notwithstanding, when a law fails to be effective, it should not be a law. That is why there should be no legal prohibition against gambling.
Which one of the following, if assumed, allows the argument's conclusion to be properly drawn?
(A) No effective law is unenforceable.
(B) All enforceable laws are effective.
(C) No legal prohibitions against gambling are enforceable.
(D) Most citizens must agree with a law for the law to be effective.
(E) Most citizens must agree with a law for the law to be enforceable.

[spoiler]LSAT; OA - A; I am confused btn A & C[/spoiler]
Source: — Critical Reasoning |

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by grockit_andrea » Sat Aug 07, 2010 9:51 am
pnk wrote:Newspaper editor: Law enforcement experts, as well as most citizens, have finally come to recognize that legal prohibitions against gambling all share a common flaw: no matter how diligent the effort, the laws are impossible to enforce. Ethical qualms notwithstanding, when a law fails to be effective, it should not be a law. That is why there should be no legal prohibition against gambling.
Which one of the following, if assumed, allows the argument's conclusion to be properly drawn?
(A) No effective law is unenforceable.
(B) All enforceable laws are effective.
(C) No legal prohibitions against gambling are enforceable.
(D) Most citizens must agree with a law for the law to be effective.
(E) Most citizens must agree with a law for the law to be enforceable.

[spoiler]LSAT; OA - A; I am confused btn A & C[/spoiler]
The passage's conclusion is that there should be no legal prohibition against gambling. This is because when a law is ineffective, it should not be a law. The major evidence to back that up is that laws against gambling are impossible to enforce, according to the second part of the first sentence. There's a disconnect here between a law being enforceable and a law being effective; the assumption is that those two words are interchangeable. The correct assumption will establish that an unenforceable law is ineffective. Choice A does that. Choice C is merely a restatement of everything following the colon in the first sentence.
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