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

$$\begin{gathered} \begin{array}{l}{\mathrm{\Delta T}}_{\mathrm{f}}=\mathrm{i}\times \mathrm{m}\times {\mathrm{K}}_{\mathrm{f}}\\ \mathrm{m}=1\text{ (given) }\\ {\mathrm{\Delta T}}_{\mathrm{F}}=\mathrm{i}\times {\mathrm{K}}_{\mathrm{f}}\end{array} \\ \mathrm{For} \mathrm{ionic} \mathrm{compounds}, \mathrm{vant} \mathrm{Hoff} \mathrm{factors} \\ \mathrm{are} \mathrm{equal} \mathrm{to} \mathrm{the} \mathrm{number} \mathrm{of} \mathrm{distinct} \mathrm{ions} \mathrm{in} \mathrm{the} \mathrm{substance}\text{'}\mathrm{s} \mathrm{formula} \mathrm{unit}. \\ \mathrm{In} \mathrm{the} \mathrm{first} \mathrm{option}, \mathrm{the} \mathrm{number} \mathrm{of} \mathrm{ions} \mathrm{is} 2 \\ \mathrm{In} \mathrm{the} \mathrm{second} \mathrm{option}, \mathrm{the} \mathrm{number} \mathrm{of} \mathrm{ions} \mathrm{is} 1. \\ \mathrm{In} \mathrm{the} \mathrm{third} \mathrm{option}, \mathrm{the} \mathrm{number} \mathrm{of} \mathrm{ions} \mathrm{is} 4. \\ \mathrm{In} \mathrm{fourth} \mathrm{option}, \mathrm{the} \mathrm{number} \mathrm{of} \mathrm{ions} \mathrm{is} 3 \end{gathered}$$
Hence, the correct option is option (C) .