A mass of 1kg is attached to the end of a rubber string 25cm long having radius 2mm,which is rotating in horizontal plane in a radius of 28cm with 50rpm.What is young modulus of string in $N/m^2$

Question

$\begin{array}{1 1}(A)\;2\times 10^6\\(B)\;3\times 10^6\\(C)\;4\times 10^6\\(D)\;5\times 10^6\end{array} $