Why do you have to continue to brake?

In this situation, you correctly selected answer 1 (refuse truck) and answer 2 (blue truck). Both are correct because the main reason to continue braking is the truck that is pulling out onto your lane. Even though you are on a priority road and generally have the right-of-way, German traffic law requires you to avoid accidents and always drive defensively. If another vehicle—like the blue truck—enters your path without yielding, you must still react and brake to prevent a collision. Always be prepared to stop or slow down when there is a hazard on the road, regardless of your right-of-way.

You did not need to select answer 3 (cyclist), since in this specific case, the immediate braking is necessary because of the truck, not the cyclist. This is an example of correct hazard perception and putting safety above rigidly following priority rules. Knowing when to yield to avoid an accident is a key part of responsible driving in Germany.