A steel wire of l=15m and r=1mm is stretched by a unknown force F.If young modulus of steel wire is $2.4\times 10^{11}N/m^2$ and change in length is $5\times 10^{-2}mm$

Question

$\begin{array}{1 1}(A)\;7.48\times 10^5N\\(B)\;8.53\times 10^5N\\(C)\;7.53\times 10^5N\\(D)\;7.63\times 10^5N\end{array} $