If $Y_{Steel}=2\times 10^{11}N/m^2$ ,what force must be applied to steel rod of $l=2m$ and $r=2mm$ to stretch it by 1mm

Question

$\begin{array}{1 1}(A)\;11.35\times 10^2N\\(B)\;23.34\times 10^2N\\(C)\;12.56\times 10^2N\\(D)\;\text{None of these}\end{array} $