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).
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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).

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).

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).

Please note the word "for that reason" - the reason is less pollutant. this is 'supported' in A.
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Re: Ethanol is a derivative of corn and other grains. When [#permalink]

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04 Feb 2017, 08:38
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?
The environmentalists claim that ethanol is superior to gasoline because it emits lower levels of carbon monoxide, a known pollutant. This claim, however, assumes that ethanol does not release any other pollutants at levels greater than does gasoline. If ethanol released twenty times more sulfur into the environment than does gasoline, for example, perhaps it would be a less attractive alternative.

A) When burned as fuel, ethanol does not release any pollutants at higher levels than does gasoline. - CORRECT. This establishes that ethanol is less polluting than gasoline.
b) Ethanol is comparable in price to gasoline. - The price of the fuels is not the issue in the argument. The environmentalists' claim is based on the levels of pollution that the fuels create.
c) Available supplies of corn are sufficient to supply several years’ worth of ethanol. - Whether there is enough corn to produce ethanol is irrelevant to whether it is less polluting than gasoline.
d) Most gasoline companies already possess the technology to produce ethanol. - Whether companies already possess the technology to produce ethanol is irrelevant to whether it is less polluting than gasoline.
e) Ethanol can be used as heating fuel - Whether ethanol can be used as heating fuel is irrelevant to whether it is less polluting than gasoline.

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Re: Ethanol is a derivative of corn and other grains. When   [#permalink] 04 Feb 2017, 08:38
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