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Re: ­To combat persistent counterfeiting, Lacland's currency was [#permalink]
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chiplesschap
Thanks for the explanation. In a world without Option C, option D would be the best answer, no?
No, you definitely want to avoid that kind of approach to the answers. The question is asking for a necessary assumption, so if D could be the "best answer," then it would be a necessary assumption. But there can't be two answers, so clearly D must not be a necessary assumption. In other words, these questions are not a matter of degree. C is necessary, and the rest are not (for the reasons Marty outlined).

Feel free to follow up if you have questions about how we can definitely eliminate D, but the short version is that the argument is saying "X worked to solve a problem." That doesn't require us to assume that something else wouldn't have worked. If I take a GMAT course and get a good score, and then say that the course helped me to succeed, that doesn't mean that I think no other course could also have helped me to succeed.
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Re: ­To combat persistent counterfeiting, Lacland's currency was [#permalink]
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