Which of the following statements is true regarding the respiratory tract? A. Lacking both glands and cartilage, the smallest airway division is the bronchiole. B. Due to lung anatomy, aspirated items...

Which of the following statements is true regarding the respiratory tract?

A. Lacking both glands and cartilage, the smallest airway division is the bronchiole.

B. Due to lung anatomy, aspirated items are more likely to end in the right lung than the left lung.

C. The lung is served by the pulmonary vasculature system alone.

D. The first line of defense in the lung is mucosal associated lymphoid tissue (i.e., MALT), which is responsible for secreting IgA.