Why are you required to stop now?

You answered correctly because both the cyclist and the green vehicle require you to stop. According to German traffic rules, you must stop when pedestrians or cyclists are crossing or about to cross your path, ensuring their safety. Additionally, the green vehicle has priority in this situation, meaning you must yield and stop to allow it to pass first. The red vehicle does not require you to stop here. Always assess the situation thoroughly, prioritizing vulnerable road users and vehicles with the right of way. This helps prevent accidents and ensures smooth traffic flow.