To Study Depression, Avshalom Caspi and Colleagues Followed a Group

To study depression, Avshalom Caspi and colleagues followed a group of nearly 1,000 people from age 3 until age 26. The investigators measured life events experienced by the participants at different ages. What were the findings?

A) People who had inherited one short form and one long form of the serotonin gene were more likely to exhibit depressive symptoms than those who had two short forms.
B) People who had inherited two long forms of the serotonin gene were more likely to exhibit depressive symptoms following stressful life events than were those who had inherited the short form.
C) People who had inherited two short forms of the serotonin gene were more likely to exhibit depressive symptoms following stressful life events than were those who had inherited the long form.
D) The risk of having a major depressive episode remained uniform, regardless of which form of the serotonin gene people carried.