When Wolfgang Köhler put chimpanzees in situations in which tempting bananas were just out of reach, he found that
a. almost all of the apes figured out a way to reach the bananas.
b. many of the apes showed humanlike emotions and advanced cognitive abilities.
c. the apes performed impressive gymnastic maneuvers to get the bananas but did not use tools.
d. apes often sat quietly for a while and then seemed to have sudden insight into a solution.
Answer: d
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