What do you need to consider in this situation?

In this situation, when a bus is stopped at a bus stop and passengers might be getting on or off, German law (§ 20 StVO) requires drivers to be especially cautious. You must always be prepared for people to cross the road to or from the bus. That is why answer 1 (People might cross the road) is correct.

Additionally, you are only allowed to pass the stationary bus at walking speed, which is generally considered to be about 4–7 km/h. This is to ensure you have enough time to react if someone unexpectedly crosses the street. That makes answer 2 (I am only allowed to pass the stationary bus at walking speed) also correct.

You do not have to completely stop and wait behind the bus unless it indicates that school children are getting on or off (such as with the flashing hazard lights). In normal cases, passing slowly at walking speed is sufficient.

Remember, approaching any stopped bus in built-up areas means expecting pedestrians on or near the road, and always reduce your speed to walking pace when passing. This keeps passengers safe and helps prevent accidents.