Force constants of two wires A and B of the same material are K and 2K respectively. If the two wires are stretched equally , then the ratio of work done in stretching $\bigg( \large\frac{W_A}{W_B} \bigg)$ is

Question

$\begin {array} {1 1} (1)\;\large\frac{1}{3} & \quad (2)\;\large\frac{1}{2} \\ (3)\;\large\frac{3}{2} & \quad (4)\;\large\frac{1}{4} \end {array}$