Final answer:
The nurse should respectfully stay with the patient and say 'Amen' at appropriate times during the prayer.
Step-by-step explanation:
The best course of action for the nurse in this situation would be to remain quietly beside the bed until the client finishes the prayer (option a). It is important for the nurse to respect the patient's religious beliefs and provide a supportive presence during this time of fear and distress. It is not appropriate for the nurse to walk out of the room (option b) or to stop the client and express discomfort with prayer (option c). By staying during the prayer and saying 'Amen' at appropriate times, the nurse can show support and empathy without compromising their own personal beliefs (option d).