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Early in the twentieth century, Lake Konfa became very polluted. Recen

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Early in the twentieth century, Lake Konfa became very polluted. Recen [#permalink]

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Early in the twentieth century, Lake Konfa became very polluted. Recently fish populations have recovered as release of industrial pollutants has declined and the lake waters have become cleaner. Fears are now being voiced that the planned construction of an oil pipeline across the lake’s bottom might revive pollution and cause the fish population to decline again. However, a technology for preventing leaks is being installed. Therefore, provided this technology is effective, those fears are groundless.

The argument depends on assuming which of the following?

(A) Apart from development related to the pipeline, there will be no new industrial development around the lake that will create renewed pollution in its waters.

(B) There is no reason to believe that the leak-preventing technology would be ineffective when installed in the pipeline in Lake Konfa.

(C) The bottom of the lake does not contain toxic remnants of earlier pollution that will be stirred into water by pipeline construction.

(D) Damage to the lake’s fish populations would be the only harm that a leak of oil from the pipeline would cause.

(E) The species of fish that are present in Lake Konfa now are the same as those that were in the lake before it was affected by pollution.

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[Reveal] Spoiler: OA

Last edited by hazelnut on 01 Oct 2017, 00:32, edited 2 times in total.
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Re: Early in the twentieth century, Lake Konfa became very polluted. Recen [#permalink]

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Yeah, the same like yours, IMO B

Early in the twentieth century, Lake Konfa became very polluted. Recently fish populations have recovered as release of industrial pollutants has declined and the lake waters have become cleaner. Fears are now being voiced that the planned construction of an oil pipeline across the lake’s bottom might revive pollution and cause the fish population to decline again. However, a technology for preventing leaks is being installed. Therefore, provided this technology is effective, those fears are groundless.
The argument depends on assuming which of the following?
A. Apart from development related to the pipeline, there will be no new industrial development around the lake that will create renewed pollution in its waters --> the argument just mentions about the planned construction of a pipeline, not about any other industrial development. The assumption will only prove that the argument has ground to develop, and is too narrow to provide ground for irrelevant fact to develop too
B. Other than the possibility of a leak, there is no realistic pollution threat posed to the lake by the pipeline’s construction --> Using the negating technique, if there is possibility that other threat can pose pollution to the lake, the fact that new techonology will prevent leak can't help completedly demolish the pollution to the lake. Therefore, the fears are still considerable. hence, Pick up this choice
C. There is no reason to believe that the leak-preventing technology would be ineffective when installed in the pipeline in Lake Konfa -->Assuming that this is true, but even when oil leaks to the lake, no facts state that oil-leaking is polluted to the lake. So, this is uncertainty
D. Damage to the lake’s fish populations would be the only harm that a leak of oil from the pipeline would cause --> Negating this choice: leak of oil from the pipeline can cause more than one damage to the lake. So what ??? it does not weaken the argument that the techonology is inffective and that the fears is not groundless. So eliminate this
E. The species of fish that are present in Lake Konfa now are the same as those that were in the lake before it was affected by pollution -->
out of scope

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Re: Early in the twentieth century, Lake Konfa became very polluted. Recen [#permalink]

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It's funny how I get this question correct in the forum, but then get it incorrect while taking the practice Test this weekend. :?

This is a GMATPrep question. OA is C.

The conclusion is actually "those fears are groundless", not "this technology is effective".

The latter is the premise. If you mistakenly identified that as the conclusion, then you would have chosen B incorrectly.



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Re: Early in the twentieth century, Lake Konfa became very polluted. Recen [#permalink]

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bigfernheard,

You are consistenent in choosing the Answers, but unfortunately both are incorrect.

Option C in the original question (Priyankumar posted) and Optiion B ( in GMAT PREP posted by you) are same. Both are wrong.


here B is the correct answer.


Option C --> in GMATPRE is totall differrent, and agree with that answer.
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Re: Early in the twentieth century, Lake Konfa became very polluted. Recen [#permalink]

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New post 23 Aug 2011, 18:35
I go for B after careful reconsideration.

The conclusion should be:
Because the techology of preventing leaking is effective, there is no need to worry about any polution.

However, B provide another consideration may weaken the conclusion. The oil construction itself may cause pollution.

While C, at first glance looks good, but dont you think it kind of deny the premise of the passage. The passage believe the effectiveness of the technology.

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Re: Early in the twentieth century, Lake Konfa became very polluted. Recen [#permalink]

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New post 23 Aug 2011, 18:38
crackHSW wrote:
Why is A opted out , how does one know that industrail development effects are not being taken into consideration here ??


A put industry development, which is not relevant.

The whole passage is talking about Oil construction, technology, pollution. We should find some OA mention something related.

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Re: Early in the twentieth century, Lake Konfa became very polluted. Recen [#permalink]

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New post 17 Oct 2011, 17:40
Agree with b too! Since it already states that the security system works! Assuming that it will not work here is grasping too far! Why wouldn't it? B is a more plausible explanation for why pollution might accure!

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Re: Early in the twentieth century, Lake Konfa became very polluted. Recen [#permalink]

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New post 19 Jan 2012, 06:39
patrickwestoo wrote:
Agree with b too! Since it already states that the security system works! Assuming that it will not work here is grasping too far! Why wouldn't it? B is a more plausible explanation for why pollution might accure!

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Are you talking about the first argument posted or the GMATPrep question? If it is the latter one, the correct answer is C.
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New post 23 Jan 2012, 14:50
B for me. I used the A.N.T technique and B fit the best. Spent 2:15 on this Q. I knew the answer was B at 1:10 but I reread question stem and answer choices

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New post 25 Feb 2012, 22:33
I go for B
B is the best when compare with C, B is a more fundamental issue for the problem. When construction itself cause problem, whether leaking preventing technology is effective or not is no longer a main issue

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Re: Early in the twentieth century, Lake Konfa became very polluted. Recen [#permalink]

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New post 26 Feb 2012, 03:23
IMO- B,

Premise- "an oil pipeline across the lake’s bottom might revive pollution and cause the fish population to decline" and "a technology for preventing leaks is being installed".
Conclusion-"provided this technology is effective, those fears are groundless."

Hence the Assumption in Option B-"Other than the possibility of a leak, there is no realistic pollution threat posed to the lake by the pipeline’s construction." is correct.

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Re: Early in the twentieth century, Lake Konfa became very polluted. Recen [#permalink]

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Early in the twentieth century, Lake Konfa became very polluted. Recently fish populations have recovered as release of industrial pollutants has declined and the lake’s waters have become cleaner. Fears are now being voiced that the planned construction of an oil pipeline across the lake’s bottom might revive pollution and cause the fish population to decline again. However, a technology for
preventing leaks is being installed. Therefore, provided this technology is effective, those fears are groundless.

The argument depends on assuming which of the following?


A. Apart from development related to the pipeline, there will be no new industrial development around the lake that will create renewed pollution in its waters.

B.There is no reason to believe that the leak-preventing technology would be ineffective when installed in the pipeline in Lake Konfa.

C.The bottom of the lake does not contain toxic remnants of earlier pollution that will be stirred into the water by pipeline construction.

D.Damage to the lake’s fish populations would be the only harm that a leak of oil from the pipeline would cause.

E.The species of fish that are present in Lake Konfanow are the same as those that were in the lake before it was affected by pollution.

Last edited by nelz007 on 13 Nov 2012, 01:08, edited 1 time in total.

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Re: Early in the twentieth century, Lake Konfa became very polluted. Recen [#permalink]

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nelz007 wrote:
Early in the twentieth century, Lake Konfa became very polluted. Recently fish populations have recovered as release of industrial pollutants has declined and the lake’s waters have become cleaner. Fears are now being voiced that the planned construction of an oil pipeline across the lake’s bottom might revive pollution and cause the fish population to decline again. However, a technology for
preventing leaks is being installed. Therefore, provided this technology is effective, those fears are groundless.

The argument depends on assuming which of the following?


A. Apart from development related to the pipeline, there will be no new industrial development around the lake that will create renewed pollution in its waters.

B.There is no reason to believe that the leak-preventing technology would be ineffective when installed in the pipeline in Lake Konfa.

C.The bottom of the lake does not contain toxic remnants of earlier pollution that will be stirred into the water by pipeline construction.

D.Damage to the lake’s fish populations would be the only harm that a leak of oil from the pipeline would cause.

E.The species of fish that are present in Lake Konfanow are the same as those that were in the lake before it was affected by pollution.


argument states that fish will be safe since the leak would be prevented with some technology. However it is assumed that leak is the only threat in construction of pipeline. option C states same assumption.

ans C it is.
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Re: Early in the twentieth century, Lake Konfa became very polluted. Recen [#permalink]

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New post 13 Nov 2012, 01:14
I also vote for C

was stuck between A and C, but C wins over A as any other construction is out of scope..... the argument is concerned with the pollution arising from the pipeline.

Also, we are not looking for a weakener.

Good question

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nelz007 wrote:
was stuck between C and D. could you explain D?

Sure. D states "Damage to the lake’s fish populations would be the only harm that a leak of oil from the pipeline would cause." But actually nowhere in the argument it is assumed so or mentioned so. leak of oil may pollute water and harm people, birds or animals drinking water from it (if at all).. but do we care? its irrelavant to the argument -which concerns fish population.

Hope it helps!
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Re: Early in the twentieth century, Lake Konfa became very polluted. Recen [#permalink]

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nelz007 wrote:
was stuck between C and D. could you explain D?


Conclusion: Therefore, provided this technology is effective, those fears are groundless.
Now ask question which fear?
Fear from pollution, that will arise from failure of the system, leading to the death of fish.

Remem the argument is not stating death of any organism from the leak of oil except Fish. Well may be it might cause the deah of other speices but is not discussed in the argument. Also if we assume the above fact its not going to validate the conclusion stated in the starting of the explanation.

Assumption is unstated necessary premise which the author takes for granted.

Hence I dont think that d plays any role in validating the conclusion.

Try negating it will have no effecct on the conclusion.
Why I am saying its out of scope because the argument is concerned about:-
1. Pollution from the leak of oil.
2. New safety system incorporated, will be helpful.
3. Population of Fish getting affected.

Hope that helps.

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Re: Early in the twentieth century, Lake Konfa became very polluted. Recen [#permalink]

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New post 16 Nov 2012, 04:28
This one can be said to be a proposal passage

making the pipe will not makes the pollution.

prethink for proposal: no bad agent the the process to be happen, or something needed to bridge the gap

in this case, there is not bad agent.

go to answer choices, C look closest. use negation test. It is ok,

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Re: Early in the twentieth century, Lake Konfa became very polluted. Recen [#permalink]

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New post 13 Aug 2013, 07:38
Minheequang wrote:
Yeah, the same like yours, IMO B

Early in the twentieth century, Lake Konfa became very polluted. Recently fish populations have recovered as release of industrial pollutants has declined and the lake waters have become cleaner. Fears are now being voiced that the planned construction of an oil pipeline across the lake’s bottom might revive pollution and cause the fish population to decline again. However, a technology for preventing leaks is being installed. Therefore, provided this technology is effective, those fears are groundless.
The argument depends on assuming which of the following?
A. Apart from development related to the pipeline, there will be no new industrial development around the lake that will create renewed pollution in its waters --> the argument just mentions about the planned construction of a pipeline, not about any other industrial development. The assumption will only prove that the argument has ground to develop, and is too narrow to provide ground for irrelevant fact to develop too
B. Other than the possibility of a leak, there is no realistic pollution threat posed to the lake by the pipeline’s construction --> Using the negating technique, if there is possibility that other threat can pose pollution to the lake, the fact that new techonology will prevent leak can't help completedly demolish the pollution to the lake. Therefore, the fears are still considerable. hence, Pick up this choice
C. There is no reason to believe that the leak-preventing technology would be ineffective when installed in the pipeline in Lake Konfa -->Assuming that this is true, but even when oil leaks to the lake, no facts state that oil-leaking is polluted to the lake. So, this is uncertainty
D. Damage to the lake’s fish populations would be the only harm that a leak of oil from the pipeline would cause --> Negating this choice: leak of oil from the pipeline can cause more than one damage to the lake. So what ??? it does not weaken the argument that the techonology is inffective and that the fears is not groundless. So eliminate this
E. The species of fish that are present in Lake Konfa now are the same as those that were in the lake before it was affected by pollution -->
out of scope


But even if we negate A we will come to the same conclusion as (B). I totally agree that (B) is correct but can someone explain me why (A) is incorrect?
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Re: Early in the twentieth century, Lake Konfa became very polluted. Recen [#permalink]

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priyankur_saha@ml.com wrote:
Early in the twentieth century, Lake Konfa became very polluted. Recently fish populations have recovered as release of industrial pollutants has declined and the lak waters have become cleaner. Fears are now being voiced that the planned construction of an oil pipeline across the lake’s bottom might revive pollution and cause the fish population to decline again. However, a technology for preventing leaks is being installed. Therefore, provided this technology is effective, those fears are groundless.
The argument depends on assuming which of the following?
A. Apart from development related to the pipeline, there will be no new industria development around the lake that will create renewed pollution in its waters.
B. Other than the possibility of a leak, there is no realistic pollution threat posed to the lake by the pipeline’s construction.
C. There is no reason to believe that the leak-preventing technology would be ineffective when installed in the pipeline in Lake Konfa.
D. Damage to the lake’s fish populations would be the only harm that a leak of oil from the pipeline would cause.
E. The species of fish that are present in Lake Konfa now are the same as those that were in the lake before it was affected by pollution.

[Reveal] Spoiler: My Take
My pick is B. I do not have OA. Please post OA if you have.


Responding to a pm: Why is (A) not correct?

What is the argument?
The argument is this: Leaks will be prevented so the oil pipeline will not cause pollution.

The argument focuses on the possible pollution caused by the oil pipeline in future, not any other source. The argument also doesn't say that the Lake will not be polluted through some other source. It narrowly focuses only on the pipeline. Hence (A) is not an assumption. It is out of scope for our argument. The argument only says that oil pipeline will not cause pollution. It doesn't say nothing else will cause pollution.
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Re: Early in the twentieth century, Lake Konfa became very polluted. Recen [#permalink]

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New post 14 Aug 2013, 07:31
VeritasPrepKarishma wrote:
priyankur_saha@ml.com wrote:
Early in the twentieth century, Lake Konfa became very polluted. Recently fish populations have recovered as release of industrial pollutants has declined and the lak waters have become cleaner. Fears are now being voiced that the planned construction of an oil pipeline across the lake’s bottom might revive pollution and cause the fish population to decline again. However, a technology for preventing leaks is being installed. Therefore, provided this technology is effective, those fears are groundless.
The argument depends on assuming which of the following?
A. Apart from development related to the pipeline, there will be no new industria development around the lake that will create renewed pollution in its waters.
B. Other than the possibility of a leak, there is no realistic pollution threat posed to the lake by the pipeline’s construction.
C. There is no reason to believe that the leak-preventing technology would be ineffective when installed in the pipeline in Lake Konfa.
D. Damage to the lake’s fish populations would be the only harm that a leak of oil from the pipeline would cause.
E. The species of fish that are present in Lake Konfa now are the same as those that were in the lake before it was affected by pollution.

[Reveal] Spoiler: My Take
My pick is B. I do not have OA. Please post OA if you have.


Responding to a pm: Why is (A) not correct?

What is the argument?
The argument is this: Leaks will be prevented so the oil pipeline will not cause pollution.

The argument focuses on the possible pollution caused by the oil pipeline in future, not any other source. The argument also doesn't say that the Lake will not be polluted through some other source. It narrowly focuses only on the pipeline. Hence (A) is not an assumption. It is out of scope for our argument. The argument only says that oil pipeline will not cause pollution. It doesn't say nothing else will cause pollution.


Hi Karishma,

Thanks for your prompt reply :). I agree that argument talks about"leaks". But the conclusion states that those fears would not hold true if the new technique is good. Now "fears" i suppose refers to the polluted lake and decline in fish population. If we negate (A), it will weaken this conclusion and hence could be a contender for correct answer.
Again, I am not at all challenging (B) is correct. I just want to know how to tackle such questions on actual GMAT within a limited time. :)
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