Final answer:
The priority nursing action when a nurse hears stridor in a client who has undergone radical neck dissection for cancer treatment is to contact the primary health care provider.
Step-by-step explanation:
The priority nursing action when a nurse hears stridor in a client who has undergone radical neck dissection for cancer treatment is to c. Contact the primary health care provider. Stridor is a high-pitched wheezing sound that occurs when there is obstruction or narrowing of the airway. It is a medical emergency that requires immediate attention. The primary health care provider will be able to assess the situation and provide appropriate interventions.