Problem: A 6-month-old patient who is ventilator-dependent with a tracheostomy tube is admitted to the pediatric intensive care unit. During suctioning, the infant's SpO2 drops to 84%. Which intervention is the most appropriate? Need Assignment Help? A. Calling the practitioner for an order to culture the tracheal secretions B. Suctioning the tracheostomy tube until resistance is met, then withdrawing the catheter while applying suction C. Instilling 0.9% sodium chloride solution and suctioning D. Delivering oxygen breaths using the ventilator