In a chemical reaction, A + 2B (K) ⇋ 2C + D, the initial concentration of B was 1.5 times of the concentration of A, but the equilibrium concentrations of A and B were found to be equal. The equilibrium constant(K) for the aforesaid chemical reaction is :
(1) 16
(2) 1/4
(3) 1
(4) 4
