Two horses begin at rest. After a few seconds, horse A is traveling with a velocity of 10 m/s west, while horse B is traveling with a velocity of 13 m/s west. Which horse had a greater acceleration? A. Horse A because its change in velocity was greater than horse B's in the same time. B. Horse B because its change in velocity was greater than horse A's in the same time. C. Horse B because its change in velocity was the same as horse A's, but it took less time. D. Both horses had the same acceleration.