I need help with this question

Dear student,
Please find below the answer:

The correct option is (1).
The partial pressure is the pressure exerted independently by a particular gas in a mixture of gases. The partial pressure of oxygen in the atmosphere, alveoli, oxygenated blood and tissue is 159 mm Hg, 104 mm Hg, 95 mm Hg and 40 mm Hg respectively.

Hope this clears your doubt.
Regards.