Two steel wire are hang from roof.Their length and radius are in the ratio 3 : 5 and 1 : 2 respectively.If the extension in first wire is 2mm,what is extension in other if force applied is in the ratio 2 : 3?

Question

$\begin{array}{1 1}(A)\;2mm\\(B)\;1.25mm\\(C)\;1mm\\(D)\;3.25mm\end{array}$