Oxygen Diffuses into the Capillaries of the Lungs Because There

Multiple Choice

Oxygen diffuses into the capillaries of the lungs because there is

A) a higher concentration of O₂ in the alveoli than the capillaries.
B) a higher concentration of O₂ in the capillaries than the alveoli.
C) a higher concentration of CO₂ in the alveoli than the capillaries.
D) a higher concentration of CO₂ in capillaries than the alveoli.
E) an equal concentration of O₂ in the alveoli and the capillaries.