Answer:
A. Non breather mask
Step-by-step explanation:
Fraction of Inspired oxygen is the term that refers to the volumetric portion of oxygen in any inhaled gas as a result of inhalation.
A non-rebreather mask is the most effective in this case. This is due to it being able to deliver quantities of the fraction of inspired oxygen (FIO2) as high as 100 percent thereby reversing the manifestations observed.
The other modes in the options such as simple mask, face tent and nasal cannula can not deliver such quantity. They usually deliver lower levels of the Fraction of Inspired Oxygen(FIO2).