Which of the Following Statements Explains Why the Mere Breathing

Which of the following statements explains why the mere breathing of 100% oxygen increases the P(A-a) O₂?

A) Because 100% oxygen impairs gas transfer from the alveolus to the blood.
B) Because 100% oxygen improves gas transfer from the alveolus to the blood.
C) Because of the unique way hemoglobin binds O2.
D) Because 100% oxygen does not change gas transfer from the alveolus to the blood.

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