What Was the Most Significant Event to Take Place Within

What was the most significant event to take place within the American Psychological Association (APA) in 1988?

A) A dramatic decrease in membership led to the recruitment of psychiatrists and others outside the psychological profession.
B) Psychoanalytic psychotherapy was officially denounced as ineffective.
C) Scientists, unhappy with the amount of emphasis placed upon clinical issues, left APA and formed the American Psychological Society.
D) To avoid confusion with the American Psychiatric Association (also abbreviated APA) , the American Psychological Association officially renamed itself the American Psychological Society.