What does this sign mean?

What does this sign mean?
A)Danger due to the proximity of a level crossing without barriers.
B)Danger due to the proximity of a level crossing with barriers.
C)Danger due to the immediate presence of a level crossing without barriers.Correct
This sign indicates danger due to the IMMEDIATE presence of a level crossing without barriers. The distance between the sign and the level crossing will be practically nil.
In contrast, in the case of the lower signs, the proximity distance could be approximately 200 metres before the level crossing.
They are usually accompanied by the lower sign shown in Image 3.