A simply supported beam of length ‘L’ carries a concentrated load W at its center. If EI is the flexural rigidity of the beam, strain energy due to bending is

A

$$\frac{W^{3}L^{3}}{12EI}$$

B

$$\frac{W^{2}L^{3}}{24EI}$$

C

$$\frac{W^{2}L^{3}}{48EI}$$

D

$$\frac{W^{3}L^{3}}{96EI}$$