When You Are Jogging, Your Muscles Are Using More Oxygen

When you are jogging, your muscles are using more oxygen and releasing more carbon dioxide into the blood than when you are at home on the couch. Which of the following would occur during your jog?

A) The concentration of bicarbonate ions HCO₃^- ) in the blood would decrease.
B) Blood pH would increase by at least 1 pH unit.
C) The medullary respiratory center would increase the rate of breathing.
D) All of the above answers apply.