What Primary Factor Is Responsible for the Normal Change in Oxygen

What primary factor is responsible for the normal change in oxygen diffusion capacity during maximum exercise?

A) Hyperventilation results in increased PaO₂s
B) The increased cardiac output results in increased ventilation/perfusion mismatch
C) Hyperventilation results in lowered H+ levels which shifts the oxygen dissociation curve
D) The increased cardiac output results in recruitment of pulmonary capillaries

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