The registered nurse flown in to help with a disaster was feeling very tired, irritable, and ...

The registered nurse flown in to help with a disaster was feeling very tired, irritable, and anxious. In addition, the nurse seemed to be having difficulty concentrating and making decisions. What is probably causing such feelings?
 
  A. The close involvement in the disaster, which has traumatized the nurse as well
  B. The knowledge that the nurse cannot meet all of the needs of the flood victims
  C. The realization that the nurse cannot undo the damage of the flood
  D. The recognition that the nurse is not adequately compensated for working this hard for this long