A number of patients in an acute cardiac care unit of a hospital have diagnoses of impaired cardiac ...

A number of patients in an acute cardiac care unit of a hospital have diagnoses of impaired cardiac conduction. Which of the following patients is most deserving of immediate medical attention?
 
  A)
  A 46-year-old man whose cardiac telemetry shows him to be in ventricular tachycardia
  B)
  A 69-year-old woman who has entered ventricular fibrillation
  C)
  A 60-year-old man with premature ventricular contractions (PVC) and a history of atrial fibrillation
  D)
  A 60-year-old woman who has just been diagnosed with a first-degree AV block