What finding would the nurse assessing the neurovascular status of a child in Russell traction report immediately?

A. Capillary refill less than 3 seconds is normal and indicates good perfusion. B. Ability to wiggle toes indicates intact motor function. C. Skin that is warm to the touch suggests adequate circulation. D. Bluish coloration (cyanosis) indicates poor oxygenation and compromised circulation, requiring immediate intervention.