Statement (A):The valency of Fe in  ${\mathrm{FeCl}}_2$ is 2 and that of ${\mathrm{FeCl}}_3$ is 2

Statement (B): In ${\mathrm{Cu}}_2{\mathrm{Cl}}_2$and ${\mathrm{CuCl}}_2$ the valency of Cu is 2 and 1 respectively.

Statement (C):in${\mathrm{SnCl}}_2$ and ${\mathrm{SnCl}}_4$ the valency of Sn is 2 and 4 respectively.