In which situation is overtaking prohibited?

Your answer is correct because in German traffic rules, overtaking is prohibited in these situations to ensure safety. First, if you cannot finish overtaking before entering a no-overtaking zone, you must not start it to avoid unsafe situations. Second, overtaking before a hill crest is forbidden because your view of oncoming traffic is limited, making the maneuver dangerous. Third, if you cannot keep enough lateral space to the overtaken vehicle, overtaking is not allowed, as insufficient side clearance can cause collisions. Always ensure clear visibility and enough space before overtaking to comply with traffic regulations and maintain safety.