Final answer:
The nurse should document the incident and report it to the supervisor.
Step-by-step explanation:
The most appropriate approach for the nurse to take in this situation would be Option 2: Document the incident and report it to the supervisor. Speaking harshly to a patient with expressive aphasia and left hemiparesis is inappropriate and goes against ethical and professional standards of care. Reporting the incident to the supervisor would ensure that appropriate action is taken to address the UAP's behavior and protect the well-being of the patient.