Final answer:
On a two-lane road, you may pass another vehicle when the driver you are passing is making a left turn.
Step-by-step explanation:
In the context of driving on a two-lane road, you may pass another vehicle when the driver you are passing is making a left turn. This means that option D is the correct answer.
Passing on a two-lane road can be dangerous and should only be done under safe conditions. It is important to follow traffic rules and regulations to ensure the safety of all drivers on the road.