Your Patient Is Speaking in Full Sentences, but Is Pale

Your patient is speaking in full sentences, but is pale and breathing slowly through his mouth. You tell him that you want to apply a mask, but he worries that he will feel "smothered." You should

A) begin by holding the mask near his face.
B) insert an oral airway
C) only apply the mask if his vital signs worsen.
D) apply a nasal cannula.