The Respiratory Center Becomes Stimulated If The

The respiratory center becomes stimulated if the:

A) amount of carbon dioxide in arterial blood increases, so more CO₂ is exhaled, thus lowering the blood pH.
B) amount of carbon dioxide in venous blood increases to retain more CO₂, thus lowering the blood pH.
C) pH of the blood goes above 7.41.
D) All of the above occur if the respiratory center becomes stimulated.