At `500 K`, the equilibrium constant for reaction `cis-C_(2)H_(2)Cl_(2) hArr transa-C_(2)H_(2)Cl_(2)` is `0.6`. At the same temperature, the equilibrium constant for the reaction `trans-C_(2)H_(2)Cl_(2) hArr cis-C_(2)H_(2)Cl_(2)` will be
A. `1.67`
B. `1.65`
C. `1.06`
D. `1.60`