If Anything Decreases Alveolar PO₂, How Does That Affect the Alveolar-Blood

If anything decreases alveolar PO₂, how does that affect the alveolar-blood oxygen pressure gradient?

A) Anything that decreases alveolar PO₂ tends to increase the alveolar-blood oxygen pressure gradient and, therefore, tends to increase the amount of oxygen entering the blood.
B) Anything that decreases alveolar PO₂ tends to decrease the alveolar-blood oxygen pressure gradient and, therefore, tends to decrease the amount of oxygen entering the blood.
C) Anything that decreases alveolar PO₂ tends to increase the alveolar-blood diffusion rate and, therefore, tends to increase the amount of oxygen entering the blood.
D) Anything that decreases PO₂ tends to increase arterial-blood PO₂ and, therefore, tends to decrease the amount of oxygen entering the blood.

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