Two cars are involved in a head-on collision in an alley. The driver of a car with mass, ma = 1,200 kg claims to have been traveling west at via = 7 m/s. The driver of the other car with mass, mb = 1,000 kg claims to have been traveling east at vib = 10 m/s. The investigating officer found that both cars were stuck together and traveled with a common final velocity of 3 m/s, eastward, after the collision. Assuming that at least one driver is correct, what does an application of the law of conservation of momentum allow the officer to conclude about the accident? A) The driver of the westbound car was moving significantly faster than reported. B) Both drivers correctly reported their velocities at the time of the collision. C) Either the driver of the westbound car overestimated his velocity or the driver of the eastbound car underestimated his velocity. D) Either the driver of the westbound car underestimated his velocity, or the driver of the eastbound car overestimated his velocity.