What does this sign mean?

What does this sign mean?
A)Danger due to a level difference along the road.
B)Danger due to the proximity of a section where gravel may be thrown up as vehicles pass.Correct
C)Danger due to the proximity of an area with frequent landslides.
The sign indicates the proximity of a section where there is a risk of gravel being thrown up as vehicles pass, requiring you to moderate speed and increase the safety distance, avoiding sudden acceleration, braking or steering movements.