A Cubical Tray,one Meter Along the Edge,contains 10,000 Small Hard $\pi$

A cubical tray,one meter along the edge,contains 10,000 small hard spheres,each 0.0010 m in radius.Assume that no sphere is in front of another.If you shoot 10⁸ small bullets (very small compared with the spheres) randomly into the broad face of the tray,the number of bullets that you can expect to be scattered by collisions with these spheres is

A) 10⁴
B) 10⁶
C) 10⁷
D) $\pi$ $\times$ 10⁶
E) 10⁸