On a road section with the "tunnel" sign, is it permitted to make a U-turn?

On a road section with the "tunnel" sign, is it permitted to make a U-turn?
A)Yes.
B)No.Correct
Making a U-turn is prohibited in any situation that prevents you from verifying that you will not endanger or obstruct other road users, such as on bends and crests with reduced visibility, or in the case of fog or heavy rain.

U-turns are also prohibited at:
- Level crossings (not prohibited in their vicinity).
- Tunnels, underpasses and road sections affected by the "Tunnel" sign.
- Motorways and dual carriageways, except in places designated for this purpose.
- On one-way carriageways and road sections.
- On all road sections where overtaking is prohibited, unless the U-turn is expressly authorised.