Final answer:
To ensure the clients' safety and timely arrival to physical therapy, the nurse should prioritize the clients based on their needs and urgency. In this case, the client who is learning crutch-walking and scheduled for discharge can be given priority and allowed to walk to therapy with the nurse's assistance.
Step-by-step explanation:
In this scenario, there are four clients scheduled for physical therapy but only three wheelchairs are available. One of the clients is learning crutch-walking and is scheduled for discharge in the morning. To ensure the clients' safety and timely arrival to physical therapy, the nurse should prioritize the clients based on their needs and urgency. In this case, the client who is learning crutch-walking and scheduled for discharge can be given priority and allowed to walk to therapy with the nurse's assistance.