Christopher Has Been Diagnosed with Dissociative Identity Disorder

Christopher has been diagnosed with dissociative identity disorder. Arthur, his child alter, handles the abuse that is being inflicted on him, allowing Christopher to escape to safety. Sandy, another alter is very strong willed and wants to get rid of the other personalities by inflicting bodily harm. Sandy is most likely which of the following alters?

A) Helper alter
B) Dominating alter
C) Persecutor alter
D) Child alter