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Every fall Croton's jays migrate south. The jays always join

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Every fall Croton's jays migrate south. The jays always join [#permalink] New post 11 Nov 2011, 06:14
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Every fall Croton's jays migrate south. The jays always join flocks of migrating crookbeaks with which they share the same summer and winter territories. If a jay from the crookbeaks it is accompanying, it wanders until it comes across another flock of crookbeaks. Clearly, therefore, Croton's jays lack the navigational ability to find their way south on their own.

Which of the following, if true, most strengthens the argument?

A. Croton's jays lay their eggs in the nests of crookbeaks which breed upon completing their southern migration.
B. The three species most closely related to crookbeaks do not migrate at all.
C. In the spring, Croton's jays migrate north in the company of Tattersall warblers.
D. Species other than Croton's jays occasionally accompany flocks of migrating crookbeaks.
E. In the spring, crookbeaks migrate north before croton's jays do.


help on this please.
[Reveal] Spoiler: OA

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Re: TOUGH CR QUESTIONS [#permalink] New post 11 Nov 2011, 10:01
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Here's the explanation:

The conclusion of the given argument is that 'Croton's jays lack the navigational ability to find their way south on their own'. The question asks us to strengthen the argument and hence this conclusion. Which of the given options would prove that the Croton's jays, indeed lack the navigational ability to find their way (south, north or any other direction)?

Option C clearly supports our conclusion by stating that the Croton's jays migrate north in the company of Tattersall warblers and it has already been given in the premise that Croton's jays always join flocks of migrating crookbeaks to travel south. Hence this option, along with the given premise supports the conclusion that Croton's jays indeed lack the navigational ability to find their way.

The other four options are clearly out of scope of the given argument.

Hope this helps.
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Re: TOUGH CR QUESTIONS [#permalink] New post 13 Nov 2011, 00:21
+ 1 for C
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Re: TOUGH CR QUESTIONS [#permalink] New post 27 Dec 2011, 22:33
C is the answer here. Others are out of scope. The navigational ability of the jays is under discussion here and option C strengthens the conclusion that the jays indeed lack that ability.
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Re: TOUGH CR QUESTIONS [#permalink] New post 28 Dec 2011, 16:32
+1 C
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Re: TOUGH CR QUESTIONS [#permalink] New post 31 Dec 2011, 02:01
Every time Jays migrate they need company,which means they lack navigational capacity hence C it is.
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Re: TOUGH CR QUESTIONS [#permalink] New post 30 Apr 2012, 11:36
It is C since the option showed jays lack the skills and have to join with another group.
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Re: TOUGH CR QUESTIONS [#permalink] New post 01 May 2012, 00:51
With C..............!!!!!!
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Re: TOUGH CR QUESTIONS [#permalink] New post 02 May 2012, 02:22
The aim here is to show that Croton Jay's can't navigate on their own either in summer or in winter.
In summer, Jay's accompany Crookbeaks whereas in winter Jay's accompany Tattersall warblers.

Option C proves that Croton Jay's lack navigation skills.
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Re: TOUGH CR QUESTIONS [#permalink] New post 22 May 2012, 11:55
C states that jays need X to migrate to north which supports the conclusion that jays has bad navigation capabilities.
Hence C it is.
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Re: TOUGH CR QUESTIONS   [#permalink] 22 May 2012, 11:55
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