Choose the correct option for the total pressure (in atm.) in a mixture of \( 4 \,g\, O _{2} \) and \( 2 \,g \,H _{2} \) confined in a total volume of one litre at \( 0^{\circ} C \) is : \( \left[\right. \) Given \( \left.R = 0.082 \,L \,atm\, mol ^{-1} K ^{-1}, T =273\, K \right] \)
(A) \( 2.518 \)
(B) \( 2.602 \)
(C) \( 25.18 \)
(D) \( 26.02 \)