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# Which of the following most logically completes the

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12 Dec 2012, 20:29
Marcab wrote:
Hii karishma.
Restating the argument: "it would be premature to conclude that the rapid developemtn of new fields will result in higher oil exports".
Two things are possible
1) there is an alternate way,apart from new fields, through which export can be increased.
2) there is no increase in exports at all.
Both the above options create a doubt that rapid development of new fields lead to higher exports.

Now D creates an alternate source(point 1) without making an assumption, whereas again saying B makes another assumption. Ask yourself, do the cars only run on fuels?

Now someone please let me know how my solution is incorrect.

You need to analyze the argument properly.

Argument: Utrania was a major exporter of oil. Some yrs back, exports dropped because investments in new fields were inhibited and old fields became depleted. Now, new fields will be developed. Still, rapid development of new fields may not result in higher exports because ....

All you are interested in is why development of new fields may not lead to increase in exports. The point is not what may lead to increase in exports. The point is why exports may not increase even though new fields will be developed. Where will the oil from the new fields go? Ofcourse, domestic consumption.

Also, there is no assumption here. Most automobiles run on fuel today. If there is a dramatic increase in the number of automobiles, a big chunk is bound to run on fuel.

It's a simple question. Treat it as such.
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Re: Which of the following most logically completes the [#permalink]

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10 Jan 2013, 11:20
I agree with Marcab, there is a slight assumption here that automobiles run on fuel. But B is the best ans and not D because we cannot conclude that new technology to extract oil from depleted resources will increase the export.
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Re: Which of the following most logically completes the [#permalink]

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11 Jan 2013, 14:08
Karishma is right, the key word here is EXPORT. Great internal consumption of oil products makes export forecast uncertain. B is clear
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20 Jan 2013, 20:44
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Expert's post
Marcab wrote:
Hii karishma.
Restating the argument: "it would be premature to conclude that the rapid developemtn of new fields will result in higher oil exports".
Two things are possible
1) there is an alternate way,apart from new fields, through which export can be increased.
2) there is no increase in exports at all.
Both the above options create a doubt that rapid development of new fields lead to higher exports.

Now D creates an alternate source(point 1) without making an assumption, whereas again saying B makes another assumption. Ask yourself, do the cars only run on fuels?

Now someone please let me know how my solution is incorrect.

Hi Marcab,

You have raised an interesting point here. Initially, I could not understand why you chose option D but after reading this post, I understand.

Let's understand the last line:

" it would be premature to conclude that the rapid development of new fields will result in higher oil exports, because"

Now, here you say that one thing possible is that " there is an alternate way,apart from new fields, through which export can be increased".

Well, even if there are alternate ways to increase exports, how does it make a conclusion premature that new fields will lead to increased exports.

An Analogy

Sometime analogies can be useful. Let's consider an analogy here:

It would be premature to say that eating one more apple a day will increase my height because I can increase height by drinking milk.

Is this argument correct? No. Why?

Because the guy is not saying that there is no other way to increase your height; He is just saying that eating an extra apple will increase my height.

Similarly, in this case, even if we say that there could be other sources through which higher exports could be achieved, we are not weakening the given argument.

Only way vs one of the ways

However, if the argument had said that

" it would be premature to conclude that the rapid development of new fields is the only way to achieve higher oil exports, because"

then we could have said that there are other avenues to increase exports, than only through new fields.

Therefore, option D is not correct.

Weakeners make assumptions

Now, regarding your other query that option B makes some assumptions. Again, a good point.

The idea is that almost all weakeners make some assumptions. There are not many weakeners, if you look at OG, which would conclusively disprove the conclusion just by their own. And in this question, we are looking for a weakener only.

Hope this helps

Feel free to ask in case of further queries.

-Chiranjeev
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Re: Which of the following most logically completes the [#permalink]

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27 Jan 2013, 01:15
Weakeners make assumptions

Now, regarding your other query that option B makes some assumptions. Again, a good point.

The idea is that almost all weakeners make some assumptions. There are not many weakeners, if you look at OG, which would conclusively disprove the conclusion just by their own. And in this question, we are looking for a weakener only.

Hope this helps

thank you e gmat for deep analysis.

I do not understand the above idea. Pls cite the og questions in which weakeners disprove the conclusion and in which weakener only weaken the conclusion. pls, cite only one question for each case. thank you very much.
I understand that if information shatters an assumption, it disproves the conclusion. if information increases doubt in an assumption, it increase doubt in the conclusion. The first is the destroyer, the second the weakner. both destroyer and weakner are correct answer for weakening question.

is my thinking correct?
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Re: Which of the following most logically completes the [#permalink]

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27 Jan 2013, 01:23
second point, so I post second time

above argument is proposal passage. if we do X, Y happen. assumption for this passage is that there is no bad agent. weakner is that there is some bad agent which prevent the happening of Y.

be armed with above thinking before going to answer choices for analysis.

now, among answer choices, B match our prethinking.

choose B.

pls, comment my above process. is it right? Thank you .
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Re: Which of the following most logically completes the [#permalink]

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27 Jan 2013, 20:05
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thangvietnam wrote:
Weakeners make assumptions

Now, regarding your other query that option B makes some assumptions. Again, a good point.

The idea is that almost all weakeners make some assumptions. There are not many weakeners, if you look at OG, which would conclusively disprove the conclusion just by their own. And in this question, we are looking for a weakener only.

Hope this helps

thank you e gmat for deep analysis.

I do not understand the above idea. Pls cite the og questions in which weakeners disprove the conclusion and in which weakener only weaken the conclusion. pls, cite only one question for each case. thank you very much.
I understand that if information shatters an assumption, it disproves the conclusion. if information increases doubt in an assumption, it increase doubt in the conclusion. The first is the destroyer, the second the weakner. both destroyer and weakner are correct answer for weakening question.

is my thinking correct?

Hi Thang.

Please find below an OG question where weakener doesn't disprove the conclusion. Or, in other words, it would require us to make assumptions to disprove the conclusion.

(Posted on according-to-the-tristate-transportation-authority-making-113718.html)
According to the Tristate Transportation Authority, making certain improvements to the main commuter rail line
would increase ridership dramatically. The authority plans to finance these improvements over the course of five
years by raising automobile tolls on the two high-way bridges along the route the rail line serves. Although the
proposed improvements are indeed needed, the authority’s plan for securing the necessary funds should be
rejected because it would unfairly force drivers to absorb the entire cost of something from which they receive no
benefit.

1.. Which of the following, if true, would cast the most doubt on the effectiveness of the authority’s plan to
finance the proposed improvements by increasing bridge tolls?
(A) Before the authority increases tolls on any of the area bridges, it is required by law to hold public hearings at
which objections to the proposed increase can be raised.
(B) Whenever bridge tolls are increased, the authority must pay a private contractor to adjust the automated
toll-collecting machines.
(C) Between the time a proposed toll increase is announced and the time the increase is actually put into effect,
many commuters buy more tokens than usual to postpone the effects of the increase.
(D) When tolls were last increased on the two bridges in question, almost 20 percent of the regular commuter
traffic switched to a slightly longer alternative route that has since been improved.
(E) The chairman of the authority is a member of the Tristate Automobile Club that has registered strong
opposition to the proposed toll increase.

The asnwer is Option D. One very obvious assumption required in this question is that past trends will be followed in the future too.

And below is the OG question where weakener does shatter the conclusion:
(Posted on unlike-the-wholesale-price-of-raw-wool-the-wholesale-price-93250.html)

Unlike the wholesale price of raw wool, the wholesale price of raw cotton has fallen considerably in the last Year.
Thus, although the retail price of cotton clothing at retail cloting stores has not yet fallen, it will inevitably fall.
Which of the following, if true, most seriously weakens the argument above?

A. The cost of processing raw cotton for cloth has increased during the last Year.
B. The wholesale price is typically higher than that of the same volume of raw cotton.
C. The operating costs of the average retail cloting store have remained constant during the last year.
D. Changes in retail prices always lag behind changes in wholesale prices.
E. The cost of harvesting raw cotton has increased in the last year.

Since, as per the weakener, the cost of processing raw cotton for cloth has increased during the last Year, we cannot say that "retail price of cotton will inevitably fall". It might or it might not fall (depends how much processing costs has increased).

As far as your reasoning goes, it is precisely right. Whether a statement increased doubt or shatters the conclusion, in both the cases, it is a weakener.

Hope this helps

Thanks,
Chiranjeev
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Re: Which of the following most logically completes the [#permalink]

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28 Jan 2013, 00:42
Thank you e gmat expert.

pls continue this discussion which is about the behavior of weakener, and, so which is important.

in the first og question, oa D requires an assumption to increase the doubt on the conclusion

in the second og question, oa A dose not requires any assumption to increase the doubt on the conclusion

that is the difference I get from you. Thank you very much.

another question

can you give me an og question, in which the weakener truely shatter the conclusion ? pls,

in the above second og question, oa A dose not shatter. oa A only cast doubt on the conlusion.

Thank you
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Re: Which of the following most logically completes the [#permalink]

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28 Jan 2013, 00:54
dear e gmat expert.

if in the second og , oa A is changed to
cost of processing of raw cotton increases much more than the price of raw cotton reduces

we have a situation in which a weakener truely shatter the conclusion.

but could you pls cite an og question which presents this case of shattering?

thank you e gmat experts.
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Re: Which of the following most logically completes the [#permalink]

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28 Jan 2013, 01:25
thangvietnam wrote:
Thank you e gmat expert.

pls continue this discussion which is about the behavior of weakener, and, so which is important.

in the first og question, oa D requires an assumption to increase the doubt on the conclusion

in the second og question, oa A dose not requires any assumption to increase the doubt on the conclusion

that is the difference I get from you. Thank you very much.

another question

can you give me an og question, in which the weakener truely shatter the conclusion ? pls,

in the above second og question, oa A dose not shatter. oa A only cast doubt on the conlusion.

Thank you

Hi Thang,

In the second case, the weakener does shatter the conclusion. The conclusion was "retail price of cotton will inevitably fall". Now, if the weakener is inserted, we cannot be sure if the price will fall.

Now, we cannot say that retail price will inevitably fall. The conclusion is not only weakened, it doesn't hold true. It is not inevitable anymore.

Hope I am making sense.

Thanks
Chiranjeev
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Re: Which of the following most logically completes the [#permalink]

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28 Jan 2013, 21:21
Expert's post
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thangvietnam wrote:

I do not understand the above idea. Pls cite the og questions in which weakeners disprove the conclusion and in which weakener only weaken the conclusion. pls, cite only one question for each case. thank you very much.
I understand that if information shatters an assumption, it disproves the conclusion. if information increases doubt in an assumption, it increase doubt in the conclusion. The first is the destroyer, the second the weakner. both destroyer and weakner are correct answer for weakening question.

is my thinking correct?

In CR questions we deal with real world scenarios. New information will either strengthen or weaken or do nothing to the conclusion. It is very very difficult for the new info to establish something without a doubt because then the new info will need to consider all possible cases. There will always be some assumptions. The new info will change the degree of confidence in our conclusion. It will not establish or refute our conclusion without any doubt.

Let me explain using an example:

Your argument: Mr X was found on the crime scene (I have been watching too much Fox Crime lately!) with a gun in his hand, blood on his clothes and victim on the floor. Mr X must be the killer (your conclusion).

I want to weaken your argument: Mr X was trying to coerce the gun out of the killer's hand. He is not the killer.
(I have successfully cast doubt on your conclusion but there are assumptions here. You can still get back. )

Your argument: But we can say without a doubt that there was no other person in that room during that time. (perhaps there is a single exit/entry point and it was guarded) Now you have strengthened your case and weakened mine but still there are assumptions.

My argument: The victim was trying to kill himself and Mr X was trying to stop him. The victim succeeded in committing suicide. Mr X is innocent.
Now I have weakened your case and strengthened mine.

We can keep at it for a long time and every new piece of info can strengthen/weaken the argument. Every new piece of info does come with assumptions. That is why, criminals are punished when their crime is established without REASONABLE doubt.

Basically, it will be very very difficult to disprove a conclusion. You can generally just weaken it.
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Re: Which of the following most logically completes the [#permalink]

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13 Apr 2013, 16:07
Blue Book CR65

Strengthen
Conclusion: The development of new oil fields WILL NOT result in higher oil exports.
Premise: Though economic situation improving and regulations are less strict.

Had C: Foreign source gives oil to Utrania, so it does not make sense for Utrania to export oil resulting in higher oil exports.
Not C: Foreigners investment in Utrania's new oil fields is good for its development and helps Utrania's oil exports resulting in higher oil exports.
It's B: Utrania's improved economic situation caused its people to use more of its oil and it is very likely that there will be LESS oil exports.
Not A: The stable price of oil will still result in higher oil exports.
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Re: Which of the following most logically completes the [#permalink]

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25 Oct 2013, 02:06
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The OA is B guys.... Its a straight B. I can see no other answer fitting the bill.
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Re: Which of the following most logically completes the [#permalink]

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07 May 2014, 20:26
mohnish104 wrote:
The OA is B guys.... Its a straight B. I can see no other answer fitting the bill.

Well said. We should not argue with the OA, because it will always be the OA.
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Re: Which of the following most logically completes the [#permalink]

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30 Sep 2014, 22:25
eazyb81 wrote:
Official Guide for GMAT Verbal Review, 2nd Edition

Practice Question
Question No.: 65
Page: 142
Difficulty:

Which of the following most logically completes the argument?

Utrania was formerly a major petroleum exporter, but in recent decades economic stagnation and restrictive regulations inhibited investment in new oild fields. In consequence, Utrania oil exports dropped steadily as old fields became depleted. Utrania's currently improving economic condition, together with less restrictive regulations, will undoubtedly result in the rapid development of new fields. However, it would be premature to conclude that the rapid development of new fields will result in higher oil exports, because:

A. the price of oil is expected to remain relatively stable over the next several years.

B. the improvement in the economic situation in Utrania is expected to result in a dramatic increase in the proportion of Utranian's who own automobiles.

C. most of the investment in the oil fields in Utrania is expected to come from foreign sources.

D. new technology is available to recover oil from old oil fields formerly regarded as depleted.

E. many of the new oil fields in Utrania are likely to be as productive as those that were developing during the period when Utrania was a major oil exporter.

The more i re-look at Gmatprep problems the more i become a fan of them..
Again, Do this when you come across a complete the passage question
Attachment:

Untitled.png [ 8.55 KiB | Viewed 913 times ]

Clearly, we need to reason as to why in spite of rapid development of of new fields, the exports many not be higher....We need to strengthen this argument...
Gap in the argument: Earlier exporter but Stagnant economy for decades and restrictive regulations inhibited investments in new oil fields.Oil exports steadily decreased because oil fields became depleted.. of Now things have changed with improving economy and less restrictive investment policies..but still we may not have higher exports from new oil fields
B points to reason of increased domestic consumption on account of vehicles..oil will come from new fields..
D. new technology is available to recover oil but from fields regarded depleted...we need to have higher exports and we have only technology but yields from these fields may not be high enough leading to low exports
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Re: Which of the following most logically completes the [#permalink]

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Re: Which of the following most logically completes the [#permalink]

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20 Dec 2016, 11:05
Utrania was formerly a major petroleum exporter, but in recent decades economic stagnation and restrictive regulations inhibited investment in new oild fields. In consequence, Utrania oil exports dropped steadily as old fields became depleted. Utrania's currently improving economic condition, together with less restrictive regulations, will undoubtedly result in the rapid development of new fields. However, it would be premature to conclude that the rapid development of new fields will result in higher oil exports, because:

Boil it down - With improved economic condition and less restrictive regulations , the domestic production is likely to increase . But if domestic demand itself increases then in spite of all this we might not see higher exports .

B. the improvement in the economic situation in Utrania is expected to result in a dramatic increase in the proportion of Utranian's who own automobiles. - Answer
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Re: Which of the following most logically completes the [#permalink]

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27 Mar 2017, 15:53
We have to make the assumption that automobiles use oil. What a stupid question. Granted, I made that assumption but I thought the whole point is that we don't. What if Utrania used electric cars?
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Re: Which of the following most logically completes the [#permalink]

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03 May 2017, 07:10
We need to find a good reason for export not going to grow.

A. No effect
B. More car owners, more gasoline will be required to fulfil new demand. So this option is a contender for a correct answer.
C. This one can logically be derived from premises in the passage, and would have been a potential correct answer for Inference type.
D. No tie to the conclusion.
E. No effect.

So answer B is the best option.
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Re: Which of the following most logically completes the [#permalink]

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15 Jun 2017, 10:10
Ans:B
If there is any rise in demand for the oil in the country, then it is highly likely that oil exports will be disturbed.
Re: Which of the following most logically completes the   [#permalink] 15 Jun 2017, 10:10

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