What is the braking distance at 60mph?

Answer: C — 210 ft

The braking distance at 60mph is the distance traveled by a vehicle from the moment the brakes are applied to the moment it comes to a complete stop. In this case, the braking distance at 60mph is 210 feet. This option is the most accurate because as the speed increases, the braking distance also increases. Options A, B, and D are incorrect because they are either too short (option A and B) or too long (option D), which would mean the vehicle would stop sooner or later than the actual braking distance at 60mph. Therefore, option C is the best answer.