Final answer:
The patient who is at greatest risk of respiratory failure and should be carefully monitored for ventilatory status throughout treatment and transport is tension pneumothorax.
Step-by-step explanation:
The patient who is at greatest risk of respiratory failure and should be carefully monitored for ventilatory status throughout treatment and transport is B. Tension pneumothorax.
A tension pneumothorax is a life-threatening condition in which air accumulates in the pleural space and progressively collapses the lung, putting pressure on the heart and other vital structures. This can lead to respiratory distress and ultimately respiratory failure if not promptly treated. Monitoring the patient's ventilatory status is crucial to ensure appropriate management and prevent further complications.