At sea level the atmospheric pressure is 760 mmHg, what is the partial pressure of oxygen (P₀₂) if Pₙ₂ is 78%, P₀₂ is 21% and Pcₒ₂ is 0.8%? Select one:
a. 3.7 mm Hg
b. 0.3 mm Hg
c. 597 mm Hg
d. 159.6 mm Hg