Which Action Would Contribute to Nurse Fatigue in a Staff

Which action would contribute to nurse fatigue in a staff nurse who is working a 12-hour shift on a medical unit and who has been assigned to take care of five patients based on a primary care model?

A) Nurse eats lunch meal at the nurse's station while answering unit phone
B) Nurse leaves the unit on time at the end of the scheduled shift
C) Nurse does not sign up for additional shifts to cover unit vacancies
D) Nurse states she typically sleeps 8 hours a night