Why are you not permitted to now overtake the bus driving ahead of you?

You answered correctly because in Germany, when a bus ahead has its hazard lights on indicating it is about to stop to pick up or drop off passengers, you must not overtake it. This is to ensure the safety of passengers who may be crossing or boarding the bus.

Additionally, the presence of the motorbike behind you makes overtaking riskier and potentially illegal, as it can cause dangerous situations.

The lack of road markings alone does not prohibit overtaking, so that is not a valid reason here. The crucial rules are that an active hazard signal on a bus means you must slow down and not overtake, and the motorbike adds another safety concern. Remembering these points will help you recognize when overtaking is forbidden to protect pedestrians and other road users.