Kelly is a nursing student who has been assigned to care for a 67-year-old postoperative patient who ...

Kelly is a nursing student who has been assigned to care for a 67-year-old postoperative patient who is very demanding. She was late for clinical rounds because she had to change the tire on her car.
 
  Kelly is in the process of preparing pain medication for her patient when her nursing instructor asks her to identify the drug classification of the pain medication she is preparing. Kelly finds the she is very frustrated and becomes tearful. Kelly's reaction to her instructor is most likely due to what ego-defense mechanism? A. Compensation
  B. Conversion
  C. Denial
  D. Dissociation