Final answer:
Overtaking and passing to the right are generally not permitted if it involves driving off the paved portion of the road, which can be unsafe and is often illegal. While passing on a four-lane road may be allowed, on a two-lane road overtaking on the right is typically only permitted when the vehicle ahead is turning left.
Step-by-step explanation:
Overtaking and passing to the right are not permitted under certain conditions, particularly when safety is a concern. Specifically, overtaking and passing to the right are not permitted A. if driving off the paved portion of the road. This is generally an unsafe practice as it can lead to collision with roadside objects or loss of vehicle control. Moreover, it's illegal to pass another vehicle by using the shoulder of the road or any unpaved surface.
Overtaking on a four-lane road may be permitted if there are two or more lanes of traffic moving in the same direction. Hence, option B is not necessarily correct as overtaking and passing on the right may be allowed in some jurisdictions if it's done safely and legally. For option C, passing on a two-lane road, one should typically pass on the left, and passing on the right is usually not allowed unless the vehicle in front is turning left and the road conditions allow for safe passing on the right.