What must you be prepared for?

Your answer is fully correct, and here is why:

You must always be prepared for all three situations shown in the answer choices:

1. Persons crossing: Pedestrians may suddenly cross the street from between parked cars, so you need to watch carefully and be ready to stop.

2. Visual obstructions: Parked vehicles create blind spots and block your view, so you can't fully see what is happening ahead or to the sides. This forces you to drive more cautiously.

3. Vehicle doors opening: People inside parked cars may suddenly open their doors to get out, which creates a hazard. You must keep a safe distance and be alert to avoid collisions.

In German traffic rules, especially in urban areas with many parked cars, these risks are common and require heightened attention. Always reduce speed and be prepared to react quickly to avoid accidents in such situations. This proactive approach improves safety for both drivers and pedestrians.