How can you reduce the danger created by the blind spot?

The selected combination of options is correct because both monitoring traffic behind at short intervals and ensuring that no road users are beside the vehicle before turning are essential for reducing the danger created by blind spots.

In German traffic law, it is imperative to ensure safety when changing lanes or turning. Monitoring behind you allows you to be aware of any vehicles that may be approaching in your blind spot. Likewise, turning only when it is safe means you have confirmed no road users are in your immediate vicinity, reducing the risk of collisions.

Option three, turning quickly, is not advisable as it does not consider the safety of surrounding traffic. In short, maintaining awareness and careful maneuvering are critical for safe driving in relation to blind spots.