
Answer:
Option C,
Greater than the partial pressure of oxygen in atmospheric air at the top of Mt. Everest.
Explanation:
The atmospheric pressure at sea level is equal to the 760 mm Hg and the corresponding partial pressure for oxygen at sea level is equal to 160 mm Hg. Â
With increasing altitude, the oxygen decreases proportionally and therefore its partial pressure also decreases with greater altitudes. The proportionate decrease in oxygen content is 21% and the number of oxygen molecules per breathe is equal to 40%
Hence, option C is correct