With Respect to Oxygen Saturation, Hemoglobin Is _____ Saturated at the PO₂

With respect to oxygen saturation, hemoglobin is _____ saturated at the pO₂ of the lungs and _____ saturated at the pO₂ of the tissue

A) 20%; 20%
B) 25%; 20%
C) 50%; 20%
D) 50%; between 30 and 70%
E) >90%; 10-30%