Final answer:
The best option for treating a COVID-19 positive patient with acute respiratory distress symptoms while in transit is intubation and bag valve mask ventilation to ensure proper airway control and adequate oxygenation.
Step-by-step explanation:
Based on the symptoms described (confusion, tachypnea, cough producing pink frothy sputum), the patient is likely experiencing acute respiratory distress and may have pulmonary edema, which is a potential complication of severe COVID-19 infection. In this scenario, the goal is to support the patient's breathing while in transit to the hospital. Intubation and bag valve mask ventilation would be the best option as it provides the most control over the patient's airway and breathing and ensures adequate oxygenation and ventilation. Nonrebreather masks and nasal cannula would not be sufficient for this level of respiratory distress. Bilevel positive airway pressure (BiPAP) may not be appropriate during transit due to the patient's altered mental status and potential for further respiratory deterioration.