Final answer:
The safest position when following a car is where you can see the driver's face in the side mirror, as it signifies that the driver can see you as well, reducing accident risks.
Step-by-step explanation:
When following a car, it is important to position your vehicle so the driver of the car in front can see you. Therefore, the correct answer is d) where you can see the driver's face in the side mirror.
Being visible to the driver in front of you ensures that they are aware of your presence, which can prevent accidents. If you position yourself such that you can see the driver's face in their side mirror, it often means that the driver can also see you in that mirror, minimizing the risk of being in a blind spot.