Why must you drive slowly here and be ready to brake?

Your answer is correct because both reasons given are important for driving slowly and being ready to brake here.

In German traffic rules, when the traffic situation is confusing or unclear—such as when several road users might appear suddenly or when visibility is limited—you must reduce speed and prepare to stop if necessary. This helps prevent accidents by giving you enough time to react.

Additionally, the presence of a child on the carriageway is a critical factor requiring extra caution. Children are unpredictable and may dart onto the road suddenly. German traffic law emphasizes protecting vulnerable road users like children by adjusting your speed and being ready to stop immediately.

The third option, about the white van moving off, is not relevant here. If the van were pulling out, you would also need to slow down, but since that’s not occurring, it doesn’t explain the need to drive slowly.

So, in summary: confusing traffic situations and the presence of children on or near the road always require slower driving and heightened readiness to brake to ensure safety.