Under what conditions is passing on the right legal?

Answer: B — When the vehicle in front is turning left and there is enough room to pass safely

Passing on the right is legal when the vehicle in front is turning left and there is enough room to do so safely. This situation might occur on a multi-lane road where one lane is dedicated to vehicles that are turning left, allowing the traffic in the adjacent lane to continue moving straight or to pass. It is essential that drivers ensure there is adequate space and that they can pass safely without endangering themselves or others. While passing on the right in other contexts might seem permissible, such as when a vehicle is stopped, on the shoulder, or when there are no vehicles in the other lane, those scenarios do not provide a clear legal pathway for passing safely as stipulated in traffic laws. Hence, the specific requirement of the vehicle turning left with adequate space ensures both legality and safety in those instances.