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A particle of mass \( \mathrm{m} \) is projected from the ground with an initial speed \( \mathbf{u}_{0} \) at an angle \( \alpha \) with the horizontal. At the highest point of its trajectory, it makes a completely inelastic collision with another identical particle, which was thrown vertically upward from the ground with the same initial speed \( \mathrm{u}_{0} \). The angle that the composite system makes with the horizontal immediately after the collision is
A. \( \frac{\pi}{4} \)
B. \( \frac{\pi}{4}+\alpha \)
C. \( \frac{\pi}{4}-\alpha \)
D. \( \frac{\pi}{2} \)
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