Final answer:
A driver on the autobahn should slow down and move over if they see a vehicle with flashing headlights approaching from behind to allow it to pass. This is considered common courtesy and may be legally required to maintain traffic flow and safety.
Step-by-step explanation:
The correct answer to whether a driver in the passing lane of the autobahn must slow down if they see a vehicle approaching from behind with flashing headlights is A. True. On the autobahn, and many other high-speed roads around the world, it is common courtesy and sometimes a legal requirement to give way to faster approaching vehicles. A driver noticing flashing headlights from behind should safely move over to allow the faster vehicle to pass. This action not only promotes better traffic flow but also helps in reducing road rage and potential accidents. However, regardless of the behavior of other drivers, one should never exceed the speed limit or drive recklessly.