At Sea Level,air Pressure Is 760 Mm of Mercury (Hg)

At sea level,air pressure is 760 mm of mercury (Hg) .If we altered the oxygen content in a hospital room to 30% oxygen and 70% nitrogen,the partial pressure of oxygen would be

A) 70% - 30% = 40%.
B) 760 x 30% = 228 mm Hg.
C) 760 x 40% = 304 mm Hg.
D) 760 x 70% = 532 mm Hg.
E) There is not enough information to calculate it.