While observing a client's face, which assessment finding requires immediate intervention by the nurse?

A. Matted and crusted eyelids may indicate an eye infection, such as conjunctivitis, but this condition is not immediately life-threatening and does not require urgent intervention. B. A flushed and diaphoretic face may suggest fever, anxiety, or other non-life-threatening conditions, but it does not require immediate intervention compared to cyanosis. C. Cyanosis of the oral mucosa indicates a lack of adequate oxygenation and is a sign of possible respiratory or circulatory distress. This finding requires immediate intervention to address the underlying cause and restore proper oxygenation. D. Jaundiced corneas suggest liver dysfunction, but this finding does not indicate an immediate life-threatening situation requiring urgent intervention.