According to the Text Authors, the Most Important Historical Event

According to the text authors, the most important historical event in the family therapy movement was

A) the introduction of child guidance in the school setting in the late 1890s.
B) Abraham and Hannah Stone opening a marriage therapy practice in the United States in the late 1920s.
C) the establishment of the American Association of Marriage Counselors in 1945.
D) when Norbert Weiner authored his book, Cybernetics, about studying communication and control in animals and machines in the late 1940s.
E) research conducted with patients of schizophrenia and their families at the Mental Research Institute in the 1950s.