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A biological perspective would be least helpful for explaining the:

Aprevalence of schizophrenia throughout the world.
Bfluctuations in mood experienced by those suffering a bipolar disorder.
Cfear of snakes experienced by a high percentage of Americans.
Ddramatic increase in reported cases of dissociative identity disorder during the past 40 or so years.

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Greenleafable

A biological perspective would be least helpful for explaining the D. dramatic increase in reported cases of dissociative identity disorder during the past 40 or so years. 
I'm assuming this is the correct answer because it is the only option which deals with a disorder over time, whereas the other options are at the present moment. 

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