If You Climb a Mountain to an Altitude Where the PO₂

Multiple Choice

If you climb a mountain to an altitude where the PO₂ is half of what it is at sea level, it is likely that

A) the decreased acidity of your blood and cerebral spinal fluid caused by the low PO₂ will cause you to breathe more rapidly.
B) feedback from your carotid bodies and aortic bodies to your medulla will increase your breathing rate.
C) you will be unable to sense the change in the PO₂ in your blood, since your body is only sensitive to changes in PCO₂ in your blood.
D) the increased acidity of your blood and cerebral spinal fluid caused by the high PCO₂ in the atmosphere will increase your breathing rate.
E) your hemoglobin will become saturated with oxygen but unable to release it in your tissues.