Cho các phản ứng sau : 2FeCl3 + 2KI => 2FeCl2 + 2KCl + I2 2FeCl2

A. ${\mathrm{I}}_2/2{\mathrm{I}}^{-}<{\mathrm{Cl}}_2/2{\mathrm{Cl}}^{-}<{\mathrm{Fe}}^{3+}/{\mathrm{Fe}}^{2+}$

B. ${\mathrm{Fe}}^{3+}/{\mathrm{Fe}}^{2+}<{\mathrm{Cl}}_2/2{\mathrm{Cl}}^{-}<{\mathrm{I}}_2/2{\mathrm{I}}^{-}$

C. ${\mathrm{I}}_2/2{\mathrm{I}}^{-}<{\mathrm{Fe}}^{3+}/{\mathrm{Fe}}^{2+}<{\mathrm{Cl}}_2/2{\mathrm{Cl}}^{-}$

D. ${\mathrm{Cl}}_2/2{\mathrm{Cl}}^{-}<{\mathrm{Fe}}^{3+}/{\mathrm{Fe}}^{2+}<{\mathrm{I}}_2/2{\mathrm{I}}^{-}$