This sign...

This sign...
A)advises the use of chains in the event of snowfall.
B)warns of the danger of driving without snow chains.
C)makes the use of chains or other authorised devices mandatory in the event of snowfall.Correct
The sign in the question indicates the obligation not to continue driving without snow chains or other authorised devices acting on at least one wheel on each side of the same drive axle.
You may continue driving when you have one of the following authorised devices fitted:
- Snow chains.
- Other authorised devices, such as textile covers.
- Winter tyres (MS), specially designed for snow and mud.
- Studded tyres, which must have rounded edges and must not protrude more than two millimetres above the surface.