Final answer:
The prisoners would react with excitement because the order implies a break from their routine.
Step-by-step explanation:
The order to 'Throw out all the dead! All corpses outside!' would likely excite prisoners on the train because it implies a break from their routine, sparking excitement (option D). The prisoners may have been living in a state of fear and uncertainty, constantly reminded of their own mortality. The order to remove the deceased individuals could signal a possible release or change in their situation, leading to enthusiasm among the prisoners (option B).