Starting with the main bronchi, list the pathway of air through the lungs.
A) Main bronchi -> Bronchioles -> Alveolar ducts -> Alveoli
B) Main bronchi -> Alveolar ducts -> Bronchioles -> Alveoli
C) Main bronchi -> Alveoli -> Bronchioles -> Alveolar ducts
D) Main bronchi -> Bronchioles -> Alveoli -> Alveolar ducts