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(B) The correct answer is $B$. In mammalian lungs,each alveolar duct ends in a passage called an atrium,which leads into a number of rounded alveolar

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More surface area for diffusion of gases

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(B) The correct answer is $B$. In mammalian lungs,each alveolar duct ends in a passage called an atrium,which leads into a number of rounded alveolar sacs. Each alveolar sac is covered with a large number of minute air sacs known as alveoli. The presence of a vast number of alveoli significantly increases the surface area available for the diffusion of gases ($O_2$ and $CO_2$),which is essential for efficient respiration.

Mammalian lungs have an enormous number of minute alveoli (air sacs). This is to allow:

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