Childhood Depression Was Not Diagnosed Until the 1980s

Childhood depression was not diagnosed until the 1980s.This is because:

A) there were not so many pressures on young people before the development of the Internet and the advent of cyberbullying.
B) there were no reliable antidepressant medications and no effective psychological treatments.
C) according to the dominant psychoanalytic model, depression was not possible until the person was old enough to have a superego.
D) sexist ideology reduced awareness of problems that were more prevalent in girls than boys.