A U-turn is prohibited in all the listed cases.
Under the traffic rules (clause 50), a U-turn is strictly prohibited at pedestrian crossings, in tunnels, on and under bridges, overpasses and viaducts, at railway crossings, and where the visibility of the road is less than 100 meters in at least one direction. Since all the listed options are correct, the option that includes all the listed cases is the right answer.
Option 1. This option is incomplete, because a U-turn is also prohibited in all the other listed places.
Option 2. This option is incomplete, because a U-turn is also prohibited in all the other listed places.
Option 3. This option is incomplete, because a U-turn is also prohibited in all the other listed places.
Option 4. This option is incomplete, because a U-turn is also prohibited in all the other listed places.