A 480-kilogram horse runs across a field at a rate of 40 km/hr. What is the magnitude of the horse's momentum?
A12 km/hr
B19,200 km/hr
C19,200 kg x km/hr
D12 kg x km/hr
A12 km/hr
B19,200 km/hr
C19,200 kg x km/hr
D12 kg x km/hr