Which statement identifies the central idea of the text? A Few prisoners were subjected to death marches, as Allied troops were able to intervene during the evacuations. B While treacherous, the SS never intended to kill any prisoners during the evacuation marches as they were needed for labor. C Towards the end of the war, some concentration camp prisoners were able to escape the SS during evacuations. D "Death marches" ended up becoming a tool for Nazi murder, but that was not the original intention of the evacuations.