An isolated particle of mass rn is moving in a horizontal plane (x-y) along the X-axis. At a certain height above the ground, it suddenly explodes into two fragments of masses $\frac{\mathrm{m}}{4} \mathrm{and} \frac{3\mathrm{m}}{4}$. An instant later, the smaller fragment is at Y = +15 cm. The larger fragment at this instant is at:

• A

  Y = -5 cm

• B

  Y = +20 cm

• C

  Y = +5 cm

• D

  Y = -20 cm