A golden ring of radius 0.5cm and cross section area $2mm^2$ is shifted to a wooden of disk of radius 8cm.If young modulus is $3\times 10^{10}N/m^2$,what is force along its length?

Question

$\begin{array}{1 1}(A)\;24KN\\(B)\;36KN\\(C)\;18KN\\(D)\;20KN\end{array} $