You have been called to an industrial warehouse for a young adult male who was exposed to an unknown chemical gas. The patient was immediately removed from the environment and presents to you with a patent airway, burning to the throat with inspiration, and complaint of shortness of breath. His vital signs are: pulse 120, respirations 28, blood pressure 164/60, and SpO2 of 90%. In addition, you note bilateral wheezing to the lungs. What should be your first action in caring for this patient?

A) Apply in-line manual spinal stabilization.
B) Administer high-concentration oxygen.
C) Identify the chemical to which he was exposed.
D) Administer a saline mist through a small-volume nebulizer.

B