Final answer:
An object with a negative velocity is moving backward (or in a direction opposite to the positive direction). So, option b is correct
Step-by-step explanation:
When an object has a negative velocity, it means that it is moving in the opposite direction of the positive direction. For example, if the positive direction is considered to be moving to the right, a negative velocity would mean that the object is moving to the left. In physics, we refer to this as moving backward. So, option b is correct, an object with a negative velocity is moving backward (or in a direction opposite to the positive direction).