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请问一道托福阅读题但是为啥A不对呢?…"Numerous theories are based on the idea

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请问一道托福阅读题
但是为啥A不对呢?

"Numerous theories are based on the idea that aggression is an inherent and natural human instinct.Aggression have been explained as an instinct that is directed externally toward others in a process called displacement,and it has been noted that aggressive impulses that are not channeled toward a specific person or group may be expressed indirectly through socially acceptable activities such as sports and competition in a process called catharsis.Biological or instinctive,theories of aggression have also been put forth by ethologists,who study the behavior of animals in their natural environments.A number of ethologists have,based upon their observations of animals,supported the view that aggression is an innate instinct common to humans."
Question- An ethologist would be most likely to study:
a,learned catharsis in a certain species of monkey
b,the evolution of a certain type of fish
c,the bone structure of a certain type of dinosaur
d,the manner in which a certain male lion fights other males lions.
ethologist是生态学研究者,是偏向于行为研究的.而A讲的更多是偏向心理行为的