When does respiratory distress change to respiratory failure?

A) When the compensatory mechanism is no longer needed and the patient goes into arrest.
B) When the patient who is short of breath, with noisy respiration, presents in the tripod position but then suddenly has the condition clear up and return to normal.
C) When the respiratory challenge continues, the systems fail with the demand for oxygen, pupils dilate, and the skin becomes hot and dry.
D) When the respiratory challenge continues, the systems cannot keep up with the demand, and skin color and mental status change.

D