A 1-Kg Chunk of Putty Moving at 1 M/s Collides

A 1-kg chunk of putty moving at 1 m/s collides with and sticks to a 5-kg bowling ball initially at rest. The bowling ball and putty then move with a momentum of

A) 1 kg m/s.
B) 5 kg m/s.
C) 0 kg m/s.
D) 2 kg m/s.
E) more than 5 kg m/s.