GMAT PRep tough CR Question

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GMAT PRep tough CR Question

by san2009 » Sat Jun 19, 2010 1:39 pm
Why is C correct?

In a certain wildlife park, park rangers are able to track the movements of many rhinoceroses because those animals wear radio collars. When, as often happens, a collar slips off, it is put back on. Putting a collar on a rhinoceros involves immobilizing the animal by shooting it with a tranquilizer dart. Female rhinoceroses that have been frequently recollared have significant lower fetility rate than uncollared females. Probably, therefore, some subtances in the tranquilizer inhibit fertility.

Inevaluating the argument, it would be most useful to determine which of the following?
a. Whether there are more collared female rhinoceroses than uncollared female rhinoceroses in the park.
b. How the tranquilizer that is used for immobilizing rhinoceroses differs, if at all, from tranquilizers used in working with other large mammals.
c. How often park rangers need to use trangquilizer dart to immobilize rhinoceroses for reasons other than attaching radio collars.
d. Whether male rhinoceroses in the wild park lose their collar any more often than the park's female rhinoceroses do
e. Whether radio collar is the only pratical means that park rangers have for tracking the movements of rhinoceroses in the park.
This question really made me bewildered as to what kind of logical reasoning is in GMAT. Please help.
OA is C
Source: — Critical Reasoning |

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by haveto » Sat Jun 19, 2010 4:16 pm
Among all the choices, C is the most plausible one.

If park rangers more often use trangquilizer dart to immobilize rhinoceroses for reasons other than attaching radio collars then both collared and uncollared females will get equally affected. Hence, it will kill the conclusion that some subtances in the tranquilizer inhibit fertility.