Four Witnesses See a Truck Hit a Small Car

Four witnesses see a truck hit a small car.If they all saw the same thing,who is likely to give the highest estimate of the truck's speed when testifying in court?

A) Sue, who was asked, "How quickly was the truck going when it hit the car?"
B) Bob, who was asked, "How quickly was the truck going when it smashed into the car?"
C) Tom, who was asked, "What speed was the car going when the accident happened?"
D) both A and B