Which research program BEST illustrates the developmental systems perspective?
A.A school district hires Piagetian educators to overhaul its curriculum.
B.A geneticist, a psychologist, and a sociologist collaborate to understand the complex causes of school phobia in children.
C.Two therapists work together on a treatment plan for depressed adolescents.
D.Experts in Erikson's psychosocial theory collaborate on a study of the effects of Hurricane Katrina.