If Left Untreated, What Course Does Dissociative Identity Disorder Usually

If left untreated, what course does dissociative identity disorder usually take across the life span?

A) Its form does not change substantially, but the frequency of switching decreases with age.
B) The natures of the alter personalities change as the person ages, but the number of them stays about the same.
C) The number of alter personalities stays about the same, but the host personality becomes increasingly aggressive.
D) Its form does not change substantially, but the number of alter personalities increases substantially.