Under what circumstances is it permissible to pass another vehicle on the right?

Answer: B — Only when the vehicle is turning left

Passing another vehicle on the right is permissible primarily when the vehicle being overtaken is making a left turn. This scenario is common in situations where a car is slowing down to turn left, and you have space to legally pass on the right without encroaching on the left lane or potential oncoming traffic. In other conditions, such as on single-lane roads or when the road is not busy, passing on the right may not be safe or legal. It's crucial to understand that roads can have specific laws regarding passing that vary by location, and generally, passing on the left is recommended for safety. Therefore, passing on the right should only occur under the clear condition of another vehicle signaling and preparing to turn left, ensuring the safety of all road users.