The Emergence of Theories Such as Those of Freud and Watson

The emergence of theories such as those of Freud and Watson in the early twentieth century reflected the:

A) increasing influence of early philosophical views of childhood.
B) incorporation of research findings into the study of child development.
C) frustration of universities trying to find suitable
articles to print in professional journals.
D) rise of young children as paid laborers in factories andmines.