A fireworks projectile is launched upward at an angle above a large flat plane. When the projectile reaches the top of its flight, at a height of h above a point that is a horizontal distance D from where it was launched, the projectile explodes into two equal pieces. One piece reverses its velocity and travels directly back to the launch point. How far from the launch point does the other piece land?
a) D
b) 2D
c) 3D
d) 4D
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