The dramatic increase in reported cases of dissociative identity disorder during the past 40 or so years most strongly suggests that symptoms of this disorder involve

A) illicit drug usage.
B) promiscuous sexual behavior.
C) binge eating.
D) role playing.

The dramatic increase in reported cases of dissociative identity disorder over the past 40 years is strongly linked to the popularization of the disorder in media and entertainment, particularly through movies and TV shows that depict characters with multiple personalities. This suggests that the symptoms of the disorder may involve role playing or imitation, rather than other behaviors like drug usage, promiscuous sexual behavior, or binge eating.