Critical Reasoning

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 becomes separated 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.


Strengthen 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.

How important is the north / south reference here?

bryan88 wrote: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 becomes separated 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.


Strengthen 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.

IMO C
Croton's jays lack the navigational ability to find their way south on their own.. Evidence they join
crookbeaks on they way back to south


A. Croton's jays lay their eggs in the nests of crookbeaks which breed upon completing their southern migration.
>> irrelevant
B. The three species most closely related to crookbeaks do not migrate at all.
>>The other species - irrelevant
C. In the spring, Croton's jays migrate north in the company of Tattersall warblers.
>> Correct .. This strengthens the argument .. about lack of naviagtional skills
D. Species other than Croton's jays occasionally accompany flocks of migrating crookbeaks.
>> Other Species -- Irrelevant
E. In the spring, crookbeaks migrate north before croton's jays do
>> This might weaken the argument

Really a very good CR man, this seems that what CRs can these guyzzz really ask.

Just could not see the option C at all. because of that I chose A as the OA, I do not know but it was much of a hunch that A strengthens the argument.

Navigational skills are under a scanner is the main conclusion and A does not at all affect that conclusion.