$A + B \rightleftharpoons C + D$ One mole each of A and B and 3 moles each of C and D are placed in 1L flask, if equilibrium constant is 2.25. Equilibrium concentrations of A and C will be in the ratio:

Question

(a) 2 : 3

(b) 3 : 2

(c) 1 : 2

(d) 2 : 1