Final answer:
Based on Maslow's theory, the priority action for a nurse would be to administer pain medication to a patient with a musculoskeletal injury to address their basic physiological needs.
Step-by-step explanation:
According to Maslow's theory of basic needs, the priority action for a nurse caring for a patient with a musculoskeletal injury would be to address physiological needs first. Thus, the priority action in the plan of care would be A) Administer pain medication. Maslow's hierarchy posits that basic physiological requirements must be met before higher-level needs such as safety and emotional support can be adequately addressed. Pain management is essential in meeting the patient's most basic need for comfort and is the foundation for healing and recovery, which aligns with Maslow's hierarchy. So, managing pain is a critical first step before addressing other needs like B) Assess respiratory status, C) Provide emotional support, and D) Immobilize the injured limb.