A nurse is providing discharge teaching to the parents of a school-age child following surgery and cast application to the right forearm. Which of the following information is the priority for the nurse to include?

A. Using a hair dryer on a cool setting can help relieve itching, but it is not as critical as ensuring circulation in the affected limb. B. Skin irritation at the cast edges should be monitored but is not the most immediate concern. C. Restricting strenuous activities is important, but it is secondary to monitoring for signs of complications like poor circulation or swelling. D. Monitoring for pallor or swelling is the priority, as it can indicate complications such as impaired circulation, compartment syndrome, or increased pressure within the cast.