B) Momentum
Look at the equation [p=mv], in which [p=momentum], [m=mass], and [v=velocity].
Example: A mass of 2 kg is moving at 5m/s.
p=mv
p=(2kg)*(5m/s) = 10 kgm/s
Now double the velocity. A mass of 2 kg is moving at 10m/s.
p=mv
p=(2kg)*(10m/s) = 20 kgm/s
The momentum doubles as well.