Ethanol is a derivative of corn and other grains. When : GMAT Critical Reasoning (CR)
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# Ethanol is a derivative of corn and other grains. When

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Ethanol is a derivative of corn and other grains. When [#permalink]

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28 Apr 2012, 21:25
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Ethanol is a derivative of corn and other grains. When burned as fuel, it emits significantly
lower levels of carbon monoxide, a major atmospheric pollutant, than does gasoline. For that
reason, environmentalists claim that ethanol is a better source of energy than gasoline. Which
of the following, if true, most strongly supports the environmentalists’ claim?
A) When burned as fuel, ethanol does not release any pollutants at higher levels than does
gasoline.
b) Ethanol is comparable in price to gasoline.
c) Available supplies of corn are sufficient to supply several years’ worth of ethanol.
d) Most gasoline companies already possess the technology to produce ethanol.
e) Ethanol can be used as heating fuel.

Main CR Qs link - cr-qs-600-700-level-131508.html
[Reveal] Spoiler: OA

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Re: CR - Strengthen - # 2 [#permalink]

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29 Apr 2012, 08:32
A) When burned as fuel, ethanol does not release any pollutants at higher levels than does
gasoline. HOLD
b) Ethanol is comparable in price to gasoline. Out of scope
c) Available supplies of corn are sufficient to supply several years’ worth of ethanol.Out of scope
d) Most gasoline companies already possess the technology to produce ethanol. Weaken the argument
e) Ethanol can be used as heating fuel. Out of scope
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Re: CR - Strengthen - # 2 [#permalink]

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08 May 2012, 21:56
mohankumarbd wrote:
Ethanol is a derivative of corn and other grains. [highlight]When burned as fuel, it emits significantly
lower levels of carbon monoxide, a major atmospheric pollutant, than does gasoline.[/highlight] For that
reason, environmentalists claim that ethanol is a better source of energy than gasoline. Which
of the following, if true, most strongly supports the environmentalists’ claim?
A) When burned as fuel, [highlight]ethanol does not release any pollutants at higher levels than does
gasoline[/highlight].
b) Ethanol is comparable in price to gasoline.
c) Available supplies of corn are sufficient to supply several years’ worth of ethanol.
d) Most gasoline companies already possess the technology to produce ethanol.
e) Ethanol can be used as heating fuel.

Main CR Qs link - cr-qs-600-700-level-131508.html

I have a doubt regarding option A and C.
Option A restates what is already mentioned in the stem.
On the other hand option C states that the corn supplies available are sufficient to supply several years' worth. If corn supply would not have been present in such a amount then there is no point in making use of ethanol.Thus in a way the following points are:
(i)Corn is available in abundance(from the answer choices)
(ii)Ethanol emits less pollution(from stem).
Thus should not the answer be C instead of A??
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Re: CR - Strengthen - # 2 [#permalink]

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22 May 2012, 11:42
piyushksharma wrote:
mohankumarbd wrote:
Ethanol is a derivative of corn and other grains. [highlight]When burned as fuel, it emits significantly
lower levels of carbon monoxide, a major atmospheric pollutant, than does gasoline.[/highlight] For that
reason, environmentalists claim that ethanol is a better source of energy than gasoline. Which
of the following, if true, most strongly supports the environmentalists’ claim?
A) When burned as fuel, [highlight]ethanol does not release any pollutants at higher levels than does
gasoline[/highlight].
b) Ethanol is comparable in price to gasoline.
c) Available supplies of corn are sufficient to supply several years’ worth of ethanol.
d) Most gasoline companies already possess the technology to produce ethanol.
e) Ethanol can be used as heating fuel.

Main CR Qs link - cr-qs-600-700-level-131508.html

I have a doubt regarding option A and C.
Option A restates what is already mentioned in the stem.
On the other hand option C states that the corn supplies available are sufficient to supply several years' worth. If corn supply would not have been present in such a amount then there is no point in making use of ethanol.Thus in a way the following points are:
(i)Corn is available in abundance(from the answer choices)
(ii)Ethanol emits less pollution(from stem).
Thus should not the answer be C instead of A??

In such kind of Qs first it is better to find out the conclusion.
Here the conclusion is the last sentence of the paragraph.
So the answer choice should support the conclusion and not anything else.
A restates the words already mentioned in the paragraph so keep it on HOLD as restating the words SUPPORTS the conclusion in this case.
C doesn't help in proving that X fuel is better than Y ( i.e. it doesn't support the conclusion) so this option is wrong.
So A is correct.

Hope it helps.
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Re: CR - Strengthen - # 2 [#permalink]

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22 May 2012, 12:19
piyushksharma wrote:
I have a doubt regarding option A and C.
Option A restates what is already mentioned in the stem.
On the other hand option C states that the corn supplies available are sufficient to supply several years' worth. If corn supply would not have been present in such a amount then there is no point in making use of ethanol.Thus in a way the following points are:
(i)Corn is available in abundance(from the answer choices)
(ii)Ethanol emits less pollution(from stem).
Thus should not the answer be C instead of A??

You have to consider that it is possible that there are other pollutants besides carbon monoxide. If say there is Pollutant ABC that exists and ethanol has a higher level of ABC than gasoline, then there's an argument AGAINST ethanol versus gasoline.
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Re: CR - Strengthen - # 2 [#permalink]

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22 May 2012, 19:57
a) When burned as fuel, ethanol does not release any pollutants at higher levels than does
gasoline. - There might be other toxins emitted when burning ethanol and gasoline. This statement compares the same and is apt option - Correct
b) Ethanol is comparable in price to gasoline. - No mention of price comparision - Irrelevant - Incorrect
c) Available supplies of corn are sufficient to supply several years’ worth of ethanol. - Availability of corn supplies is irrelevant in the present context - Incorrect
d) Most gasoline companies already possess the technology to produce ethanol. - Neither weakens nor strengthens the arguement - Incorrect
e) Ethanol can be used as heating fuel. - Uses of Ethanol is not appropriate to the present context - Incorrect
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Re: CR - Strengthen - # 2 [#permalink]

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23 May 2012, 05:52
piyushksharma wrote:
mohankumarbd wrote:
Ethanol is a derivative of corn and other grains. [highlight]When burned as fuel, it emits significantly
lower levels of carbon monoxide, a major atmospheric pollutant, than does gasoline.[/highlight] For that
reason, environmentalists claim that ethanol is a better source of energy than gasoline. Which
of the following, if true, most strongly supports the environmentalists’ claim?
A) When burned as fuel, [highlight]ethanol does not release any pollutants at higher levels than does
gasoline[/highlight].
b) Ethanol is comparable in price to gasoline.
c) Available supplies of corn are sufficient to supply several years’ worth of ethanol.
d) Most gasoline companies already possess the technology to produce ethanol.
e) Ethanol can be used as heating fuel.

Main CR Qs link - cr-qs-600-700-level-131508.html

I have a doubt regarding option A and C.
Option A restates what is already mentioned in the stem.
On the other hand option C states that the corn supplies available are sufficient to supply several years' worth. If corn supply would not have been present in such a amount then there is no point in making use of ethanol.Thus in a way the following points are:
(i)Corn is available in abundance(from the answer choices)
(ii)Ethanol emits less pollution(from stem).
Thus should not the answer be C instead of A??

Please note the word "for that reason" - the reason is less pollutant. this is 'supported' in A.
Re: CR - Strengthen - # 2   [#permalink] 23 May 2012, 05:52
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# Ethanol is a derivative of corn and other grains. When

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