A nurse on an inpatient mental health unit is monitoring a visit between a patient who has a history of aggressive behavior and the patient's partner. Which observation indicates a potential for violence?

A. The patient is taking numerous deep, measured breaths.
B. The patient is calm telling their partner that "the staff here is so controlling".
C. The patient is sitting with their head in their hands and appears to be crying.
D. The patient is pacing around the chair the partner is sitting in.