Final answer:
B. Front. The front bumper of a vehicle is the reference point in a forward movement.
Step-by-step explanation:
The "Vehicle Reference" in a forward movement is the Front bumper.
When a vehicle is moving forward, the front bumper becomes the reference point for measuring distances. The rear bumper is not used as a reference in this case.
For example, if you see a car moving towards you, and you want to estimate the distance between the car and you, you would generally take the front bumper as the point of reference.