选择题：A healthy 32-year-old woman undergoes pulmonary exercise stress testing prior to starting a training regimen in preparation for her first marathon.Normally, during moderate aerobic exercise, which of the following occurs?

A healthy 32-year-old woman undergoes pulmonary exercise stress testing prior to starting a training regimen in preparation for her first marathon.Normally, during moderate aerobic exercise, which of the following occurs? A.Alveolar ventilation increasesB.Arterial lactate level increasesC.PaCO2 decreasesD.PaO2 increases