The equilibrium constants Kp1 and Kp2 for the reactions, X ⇋ 2Y and Z ⇋ P + Q respectively are in the ratio of 1:9. If the degree of dissociation of x and z are equal then the ratio of total pressure at these equlibria is
(a) 1 : 36
(b) 1 : 1
(c) 1 : 3
(d) 1 : 9
