12.2gm of benzonic acid (M=122) in 100gm benzene has depression in freezing point $2.6^{\large\circ}C$; $K_f = 5.2 ^{\circ} mol^{-1}kg$. If there is 100% polymerization, the number of molecules of benzonic acid in associated state is

Question

$\begin{array}{1 1}(a)\;4\\(b)\;3\\(c)\;2\\(d)\;1\end{array}$