Jerome Pitches a Baseball of Mass 0

Jerome pitches a baseball of mass 0.15 kg.The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Jerome with a return speed of 60 m/s.What is the magnitude of change in the ball's momentum?

A) 3 kg⋅m/s
B) 6 kg⋅m/s
C) 9 kg⋅m/s
D) 15 kg⋅m/s
E) ​20 kg⋅m/s