A system comprises of two small spheres with same masses 'm'. Initially the spring is undeformed. The spheres are set in motion in gravity free space at the velocities as shown in the diagram. The maximum elastic potential Energy stored in the system is.

• A

  $\frac{{{\mathrm{mv}}^2}_0}{2\sqrt{2}}$

• B

  ${{\mathrm{mv}}_0}^2$

• C

  $\frac{1}{2}{{\mathrm{mv}}^2}_0$

• D

  $2{{\mathrm{mv}}^2}_0$