A male client abruptly sits up in bed, reports having difficulty breathing and has an arterial oxygen saturation of 88%.. Non-rebreather mask

A male client abruptly sits up in bed, reports having difficulty breathing and has an arterial oxygen saturation of 88%. Which mode of oxygen delivery would most likely reverse the manifestations?
a.    Simple mask
b.    Non-rebreather mask
c.    Face tent
d.    Nasal cannula

Answer B.
A non-rebreather mask can deliver levels of the fraction of inspired oxygen (FIO2) as high as 100%. Other modes - simple mask, face tent and nasal cannula - deliver lower levels of FIO2.