A stationary body explodes into two parts of masses ‘ \mathrm{M}_{1}{ }^{\prime} and \mathrm{M}_{2} ‘. They move in opposite directions with velocities ‘ {v}_{1} ‘ and ‘ \mathrm{v}_{2} ‘. The ratio of their kinetic energies is (A) \left[\frac{\mathrm{M}_{2}}{\mathrm{M}_{1}}\right] (B) \left[\frac{\mathrm{M}_{2}}{\mathrm{M}_{1}}\right]^{\frac{1}{2}} (C) \left[\frac{\mathrm{M}_{1}}{\mathrm{M}_{2}}\right]^{2} (D) \left[\frac{\mathrm{M}_{2}}{\mathrm{M}_{1}}\right]^{2}