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QOTD #2 Bedbug infestations have been a problem

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QOTD #2 Bedbug infestations have been a problem [#permalink]  06 May 2016, 00:50
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Bedbug infestations have been a problem in major cities for years. The pesticide DDT has been found to be useful in killing bedbugs. However, DDT was banned in the United States and has been replaced by weaker pesticides. Thus, there is no effective means for eradicating bedbugs in the United States.

Which of the following, if true, most weakens the conclusion?

(A) Bedbugs resemble other small insects in their appearance and behavior.

(B) Bedbugs have largely been eradicated in other parts of the world.

(C) Some treatments that do not include DDT have proven effective against bedbugs in other parts of the world.

(D) Bedbugs are resistant to the types of pesticides used to treat cockroach and ant infestations.

(E) The number of bedbug infestations has risen significantly in the 21st century.
[Reveal] Spoiler: OA

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Re: QOTD - Bedbug infestations have been a problem in major citi [#permalink]  15 May 2016, 19:19
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The argument assumes DDT to be the only treatment. Answer Choice C by suggesting alternative treatments weakens the argument.
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Joined: 18 Apr 2015
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Kudos [?]: 274 [0], given: 1144

Re: QOTD - Bedbug infestations have been a problem in major citi [#permalink]  16 May 2016, 00:11
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OE

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This is a Logic question that asks you to weaken an argument. The author cites a problem: a pesticide that is effective in killing bedbugs is no longer available for use. Thus, the author claims, there is no effective means to kill the bedbugs in the United States. The problem here is that the author makes a very large jump between “replaced by weaker pesticides” and “there is no effective means.” Finding something that attacks this assumption would be a good way to weaken the argument. Regarding choice (A), the behaviors of bedbugs have nothing to do with the ability to eradicate them. Choice (B) does not specify how bedbugs were eradicated in other parts of the world. It is possible that all successful eradications elsewhere relied on DDT. Correct choice (C) opens up the possibility that there might be an approved means to eradicate the dreaded bedbug in the United States. It also calls the author’s conclusion about there being “no effective means for eradicating bedbugs in the United States” into question. Choice (D), though largely out of scope, might be viewed as strengthening the author’s conclusion, as it points to more evidence that existing pesticides are not effective on bedbugs. However, eliminating one possibility is not the same as eliminating all possibilities, which is what the author does in the conclusion. As for choice (E), the number of infestations has nothing to do with the ability to eliminate bedbugs in the United States.

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Re: QOTD - Bedbug infestations have been a problem in major citi   [#permalink] 16 May 2016, 00:11
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