Final answer:
The correct answer is C. both of the above. In the context of driving, changing circumstances refer to situations that require a driver to adapt or adjust their driving behavior.
Step-by-step explanation:
The correct answer is C. both of the above. In the context of driving, changing circumstances refer to situations that require a driver to adapt or adjust their driving behavior. Both a person standing up from a seated position and a car accelerating while driving are examples of changing circumstances that a driver may encounter.