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# At ground level, ozone is a harmful pollutant, but in the

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At ground level, ozone is a harmful pollutant, but in the [#permalink]

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16 Jun 2009, 16:56
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4. At ground level, ozone is a harmful pollutant, but in the stratosphere it shields the Earth from the most biologically harmful radiation emitted by the Sun, radiation in the ultraviolet band of the spectrum.
(A) in the stratosphere
(B) in the stratosphere, in which
(C) it is in the stratosphere in which
(D) in the stratosphere where
(E) it is in the stratosphere and
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16 Jun 2009, 17:06
Confused between A and D , will go with A for conciseness
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16 Jun 2009, 18:00
IMO A....
somehow I feel placing where in choice D makes the sentence ask for more placeholders...the sentence does not completes
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16 Jun 2009, 18:34
Even I feel the same. I thought of D but where makes the sentence incomplete...
I go for A.
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17 Jun 2009, 01:29
A it is.

D makes the sentence incomplete.
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17 Jun 2009, 03:50
Count one more vote for A. All other options sound awkward and wordy.
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17 Jun 2009, 07:52
Could you provide explanation for the choices ? I know the answer so instead of saying A,B,C,D and E please provide the logic and rules behind it. I wrote the question here to learn what was my mistake and why this mistake arised.
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17 Jun 2009, 09:51
I also think the answer is A. This is a construction that follows the "A but B" format, which typically requires that A and B be parallel in structure. Looking at the choices:

(A) in the stratosphere - correctly contrasts with 'at the ground level'
(B) in the stratosphere, in which - in which is redundant, already contains 'in'
(C) it is in the stratosphere in which - distorts meaning, awkward
(D) in the stratosphere where - breaks parallelism, 'where' redundant
(E) it is in the stratosphere and - distorts meaning, breaks parallelism
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18 Jun 2009, 05:45
Another A...Using D would seem to make an incomplete sentence...
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19 Jun 2009, 09:57
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perfectstranger wrote:
4. At ground level, ozone is a harmful pollutant, but in the stratosphere it shields the Earth from the most biologically harmful radiation emitted by the Sun, radiation in the ultraviolet band of the spectrum.
(A) in the stratosphere
(B) in the stratosphere, in which
(C) it is in the stratosphere in which
(D) in the stratosphere where
(E) it is in the stratosphere and

B, C and E require the additional verb.e.g.
In my class, Kate is intelligent, but in another class in which/where there are other bright students, she is not noticeable. The example above must have the similar structure to be right. E is wordy. So A remains correct.
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Re: At ground level, ozone is a harmful pollutant, but in the [#permalink]

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14 Jul 2016, 11:38
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: At ground level, ozone is a harmful pollutant, but in the   [#permalink] 14 Jul 2016, 11:38
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