You Mix Reagents (A, B, C, D)so That Each Is $\frac{[\mathrm{C}][\mathrm{D}]}{[\mathrm{A}][\mathrm{B}]}$

Multiple Choice

You mix reagents (A, B, C, D) so that each is present at an initial concentration of 0.5M. The equilibrium constant for the reaction K_eq is 4. Which choice represents the final concentrations of each reagent $\frac{[\mathrm{C}][\mathrm{D}]}{[\mathrm{A}][\mathrm{B}]}$ once equilibrium is achieved?

A) [ 0.67][0.67] [ 0.33][0.33]
B) [ 0.5][0.5] [ 0.25][0.25]
C) [ 0.4][0.4] [ 0.5][0.5]
D) [ 0.4][0.4] [ 0.1][0.1]