You are approaching a bus stop marked like this. What do you do if you see children there?

Your answer is correct. According to German traffic rules, when you approach a bus stop marked with the "H" symbol and see children (especially a school bus stop), you must reduce your speed and be ready to brake. This is because children may unexpectedly enter the roadway, and extra caution is necessary to prevent accidents.

The sign you see means it is a school bus stop operating on weekdays during the specified hours. Even if the bus is not currently stopping, your speed should be reduced in this area to ensure safety. The rules do not differentiate between a regular bus and a school bus stop in terms of speed reduction when children are present; readiness to slow down and brake is key.

Therefore, slowing down and being prepared to stop is the safest and legally correct action here.