A firework shell is launched vertically into the air and at the top of its trajectory an explosive charge breaks the shell into two pieces. In which directions is it possible for the two pieces to move? The pieces do not necessarily have equal mass and the arrows indicate only the direction of the velocity, not the magnitude.
A. A only
B. A or B
C. A, B, or C
D. A,B,C, or D
E. All of the above are possible
F. None of the above are possible