What Is the Major Difference Between Dissociative Amnesia and Retrograde

What is the major difference between dissociative amnesia and retrograde amnesia?

A) Retrograde amnesia patients often suffer from some form of physical brain trauma.
B) Individuals suffering from dissociative amnesia often have a history of memory loss that seems to be hereditary.
C) Those suffering from dissociative amnesia have prior damage to the brain, which in turn causes memory loss.
D) Retrograde amnesia patients often have suffered from painful psychological trauma.