Two Skaters at Rest, One of 100 Kg and the Second

Multiple Choice

Two skaters at rest, one of 100 kg and the second of 50 kg, push off against one another. The total momentum of the system after they push off is

A) positive.
B) zero.
C) negative.
D) increasing as the skaters move away from each other.
E) decreasing as the skaters move away from each other.