Answer:
Severe emotional trauma that occurred in childhood.
Step-by-step explanation:
Dissociative identity disorder is also called multiple personality disorder, it is a mental condition and it is identified by the presence of two or more distinct personalities within one individual.
The person exihibits two personalities and when one is active it take control of the person's behavior and the person forget the memory of the other personality.
One of the characteristics of DID is loss of child hood memory theorist believes dissociative identity disorder is caused by a severe emotional trauma faced during child hood i.e the disorder arise as a result of the trauma the child faced while growing up It can be treated with given medications, psychotheraphy with the help of an expert to process memory lost.