In Which of the Following Situations Would You,as the Head

In which of the following situations would you,as the head nurse,be concerned about potential safety issues?

A) Jordan comes to your office to complain about inadequate staffing on the unit.He says that he is concerned because he attributes a recent incident to the staffing levels.
B) Heinrich,a long-standing RN on the unit,has begun to miss work regularly.He calls in but is vague about his reasons for the absences.
C) Carla,RN,has just ended a relationship with Jake,RN,and he will not leave her alone.You are meeting with Jake today because colleagues on night shifts have reported that Jake seems to have been intoxicated last night and the previous night.
D) Sarah is very quiet and says almost nothing in team meetings.Lately,she has been much more animated since becoming friendly with a couple of other RNs on the unit.