What is the original speed and direction of the 0.125 kg cart before the collision?

A) 6.0 m/s in the same direction as the 0.25 kg cart
B) 6.0 m/s in the opposite direction to the 0.25 kg cart
C) 3.0 m/s in the same direction as the 0.25 kg cart
D) 3.0 m/s in the opposite direction to the 0.25 kg cart