1.0 M aqueous solution of \[CrC{{l}_{3}}.6{{H}_{2}}O\] freezes at \[-5.58{}^\circ C\]. Assuming complete ionization of the hydrated complex, which of the following isomers conforms to the observation (\[{{K}_{f}}\] for water \[=1.86K\,kg\,mo{{l}^{-1}}\])?

• A. \[[Cr{{\left( {{H}_{2}}O \right)}_{3}}C{{l}_{3}}].3{{H}_{2}}O\]
• B. \[[Cr{{\left( {{H}_{2}}O \right)}_{4}}C{{l}_{4}}]Cl.2{{H}_{2}}O\]
• C. \[[Cr{{\left( {{H}_{2}}O \right)}_{5}}Cl]C{{l}_{2}}.{{H}_{2}}O\]
• D. \[[Cr{{\left( {{H}_{2}}O \right)}_{6}}]C{{l}_{3}}\]