Assume air contains 21% oxygen and 79% nitrogen. If air is compressed to 5.5atm, what is the partial pressure of the oxygen?

Question

$\begin{array}{1 1} (a) \;1.16atm \\ (b)\; 3.52atm \\ (c)\; 2.23atm \\ (d)\; 4.34atm \end{array} $