Although His Original Theory of Personality Has Been and Continues

Although his original theory of personality has been and continues to be criticized, Sigmund Freud's ideas served to inspire the work of other personality theorists who made significant future contributions to the field. In this sense, Freud's theory could be considered "useful" because it ________.

A) stimulated the discovery of new knowledge
B) suggested that personality is shaped by behaviours that appear to fit together
C) allowed researchers to predict future events with relative accuracy
D) provided a comprehensive framework to explain known facts