A large box moves vertically downwards with an acceleration a. A toy gun fixed at `A` aimed towards `C` fires a particle `P`.
A. `P` will hit `C` if `a = g`
B. `P` will hit the roof `BC`, if `fa gt g`
C. `P` will hit the wall `CD` if ` alt g`
D. May be either `(A),(B)` or `(C )`, depending on the speed of projection of `P`.