Which of the following is an example of local control over breathing?

A) the interneuron groups of the pons refining the contractions involved with inhalation and exhalation
B) the aortic bodies signalling an increase in breathing rate when blood pH is acidic
C) the carotid bodies signalling an increase in breathing rate when O₂ levels are low
D) automated lung ventilation and lung perfusion adjustments maximizing O₂ and CO₂ exchange