Depression in freezing points of $0.1\;M$ aqueous solution of $HCl,CuSO_4$ and $K_2SO_4$ are

Question

$\begin{array}{1 1}(a)\;\text{in the ratio of 1 : 2 : 3}\\(b)\;\text{in the ratio of 2 : 4 : 4}\\(c)\;\text{in the ratio of 2 : 2 : 3}\\(d)\;\text{equal}\end{array}$