b
Both \(O _{2}\) and \(N _{2}\) gases in vessel \(C\) will behave independently since, \(V _{ av }=\) \(\sqrt{\frac{8 RT }{\pi M }}\) depends only on the temperature and mass of the gas molecule, there is no difference between the \(V _{\text {av }}\) of \(O _{2}\) in vessel \(A\) and \(C\) is \(V _{1}\)