For 1molal aqueous solution of the following compounds, which one will show the highest freezing point?

A. [Co(H₂O)₅Cl]Cl₂ . H₂O
B. [Co(H₂O)₄Cl₂]Cl . 2H₂O
C. [Co(H₂O)₃Cl₃] . 3H₂O
D. [Co(H₂O)₆] Cl₃