In a study of the cognitive abilities of white-faced
capuchin monkeys (Cebus imitator), researchers
neglected to control for the physical difficulty of the
tasks they used to evaluate the monkeys. The
cognitive abilities of monkeys given problems
requiring little dexterity, such as sliding a panel to
retrieve food, were judged by the same criteria as
were those of monkeys given physically demanding
problems, such as unscrewing a bottle and inserting a
straw. The results of the study, therefore, ______
Which choice most logically completes the text?
A) could suggest that there are differences in
cognitive ability among the monkeys even
though such differences may not actually exist.
B) are useful for identifying tasks that the monkeys
lack the cognitive capacity to perform but not for
identifying tasks that the monkeys can perform.
C) should not be taken as indicative of the cognitive
abilities of any monkey species other than
C. imitator.
D) reveal more about the monkeys’ cognitive
abilities when solving artificial problems than
when solving problems encountered in the wild. 
 There should be exactly 5 paragraphs separated by the markdown divider: ***.
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