The equilibrium constants $K_{p_{1}}$ and $K_{p_{2}}$ 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 be equal then the ratio of total pressure at these equilibria is

Question

( A ) 1 : 36
( B ) 1 : 3
( C ) 1 : 1
( D ) 1 : 9