You should know that from this sign onwards there is danger due to the proximity of...

A)large puddles of water that require a reduction in speed.
B)an area with frequent rockfalls.
C)a section of road where there is a risk of gravel being projected as vehicles pass.Correct
The sign indicates danger due to the proximity of a section of road where there is a risk of gravel being projected as vehicles pass.
The sign that warns of the danger of frequent rockfalls is the following: