The figure shows a diagrammatic view of the human respiratory system with labels $A, B, C$,and $D$. Select the option which gives the correct identification and main function and/or characteristic.
- A$C$ - Alveoli - Thin-walled vascular bag-like structures for the exchange of gases.
- B$D$ - Lower end of lungs - Diaphragm pulls it down during inspiration.
- C$A$ - Trachea - Long tube supported by complete cartilaginous rings for conducting inspired air.
- D$B$ - Pleural membrane - Surrounds ribs on both sides to provide a cushion against rubbing.
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