Final answer:
The nurse should call for assistance first when a client is found unconscious and not breathing.
Step-by-step explanation:
Cardiopulmonary resuscitation (CPR) is a life-saving technique used in emergencies when a person's heartbeat or breathing has stopped. CPR can help maintain blood circulation and provide oxygen to the brain and other vital organs until more advanced medical help arrives. It is crucial to perform CPR promptly in situations such as cardiac arrest, drowning, or suffocation.
In this scenario, the nurse should take the action of c) Call for assistance first. When a client is found unconscious and not breathing, it is important to call for help immediately. This ensures that additional healthcare providers can arrive quickly to assist with the situation.