Partial pressure (in $mm \ Hg$) of oxygen and carbon dioxide at different parts involved in diffusion in comparison to those in the atmosphere. Identify $A$ and $B$ and choose the correct option accordingly.
Gas Atmospheric Air Alveoli $O_{2}$ $159$ $A$ $CO_{2}$ $0.3$ $B$
| Gas | Atmospheric Air | Alveoli |
| $O_{2}$ | $159$ | $A$ |
| $CO_{2}$ | $0.3$ | $B$ |
- A$A - 50; B - 50$
- B$A - 104; B - 40$
- C$A - 40; B - 104$
- D$A - 101; B - 45$
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