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Tough LSAT CR Question

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Intern
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Joined: 14 Feb 2012
Posts: 31
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Kudos [?]: 1 [0], given: 6

Tough LSAT CR Question [#permalink] New post 09 Oct 2013, 00:44
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

88% (02:44) correct 11% (01:32) wrong based on 34 sessions
Modern navigation systems, which are found in most of today's commercial aircraft, are made with low-power circuitry, which is more susceptible to interference than the vacuum-tube circuitry found in older planes. During landing, navigation systems receive radio signals from the airport to guide the plane to the runway. Recently, one plane with low-power circuitry veered off course during landing, its dials dimming, when a passenger turned on a laptop computer. Clearly, modern aircraft navigation systems are being put at risk by the electronic devices that passengers carry on board, such as cassette players and laptop computers.

Which one of the following, if true, LEAST strengthens the argument above?

(A) After the laptop computer was turned off, the plane regained course and its navigation instruments and dials returned to normal.

(B) When in use all electronic devices emit electromagnetic radiation, which is known to interfere with circuitry.

(C) No problems with navigational equipment or instrument dials have been reported on flights with no passenger-owned electronic devices on board.

(D) Significant electromagnetic radiation from portable electronic devices can travel up to eight meters, and some passenger seats on modern aircraft are located within four meters of the navigation systems.

(E) Planes were first equipped with low-power circuitry at about the same time portable electronic devices became popular.

Question has already been posted, without discussion.
Please discuss, OA will be posted later on.
[Reveal] Spoiler: OA
3 KUDOS received
Intern
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GMAT ToolKit User
Re: Tough LSAT CR Question [#permalink] New post 09 Oct 2013, 01:05
3
This post received
KUDOS
Straight E.

Pl note that the question asked is what "least strengthens"(not weaken) the argument. So each of the 4 incorrect answer choices will strengthen the conclusion of the argument.

Conclusion: Modern electronic aircraft navigation system is at risk because of the electronic devices that passengers on board carry.

(A) After the laptop computer was turned off, the plane regained course and its navigation instruments and dials returned to normal.
Strengthens. This clearly strengthens the argument by stating that a laptop might have caused the problem in the navigation instruments and dials. Hence out

(B) When in use all electronic devices emit electromagnetic radiation, which is known to interfere with circuitry.
Strengthens. Clearly implies that all electronic devices will cause problems to the circuitry. Hence out

(C) No problems with navigational equipment or instrument dials have been reported on flights with no passenger-owned electronic devices on board.
Strengthens.Creates a correlation between electronic devices and problems with navigational equipment or instrument dials. Hence out

(D) Significant electromagnetic radiation from portable electronic devices can travel up to eight meters, and some passenger seats on modern aircraft are located within four meters of the navigation systems.
Strengthens. This option again directly mentions that electronic devices within an 8 meter range can harm the navigation systems. Hence out

(E) Planes were first equipped with low-power circuitry at about the same time portable electronic devices became popular.
Does not strengthen. This option ideally does nothing as far as the conclusion is concerned. It neither strengthens nor weakens the argument. Hence correct

Hence E is correct

Hope its clear :)
_________________

Kudos plz if it helped

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Re: Tough LSAT CR Question [#permalink] New post 11 Oct 2013, 11:03
I am with E.

other all strengthen the statement but E not appropriate option to strengthen argument.
Re: Tough LSAT CR Question   [#permalink] 11 Oct 2013, 11:03
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