What must you anticipate in this situation?

Your answer is completely correct because you identified the two main hazards indicated by the traffic situation.

Firstly, the road sign shows children crossing, which means you must expect children who might suddenly walk onto the road. Children may be unpredictable, so you should reduce speed and be especially alert.

Secondly, the parked cars on the right side may have people exiting from the side nearest the road. Passengers opening doors can be dangerous if you drive too close without caution, so you need to be prepared to stop or slow down.

The third option, about a pedestrian crossing, is not indicated here. The sign specifically warns about children, not a marked pedestrian crossing.

In summary, German traffic rules require drivers to anticipate potential hazards from children walking onto the road near such signs and from passengers exiting vehicles on the road side. That is why your selected answers are correct.