When overtaking, when should you return to the right lane?

When overtaking, when should you return to the right lane?
A)After driving 200 metres ahead of the car.
B)After 15 seconds.
C)After seeing the front of the overtaken vehicle in the mirror.Correct
To safely return to the right lane, it is essential to have left an adequate safety distance from the overtaken vehicle. The visual reference to confirm this distance is being able to see the entire front of that vehicle through the interior rear-view mirror. This ensures you do not obstruct its progress or force it to brake.