The Number of Diagnosed Cases of Dissociative Identity Disorder Increased

The number of diagnosed cases of dissociative identity disorder increased in the 1980s and 1990s.Some researchers are concerned about this trend,stating that:

A) the disorder cannot be definitively diagnosed until the person has been in therapy for more than seven years.
B) there are no research studies that confirm the disorder's existence.
C) many of the cases are unintentionally produced by clinicians.
D) this is a ploy used by criminals to try to avoid consequences for their criminal activity.