What does this warning sign indicate?

A)The proximity of a cyclist crossing.
B)The obligation to travel along a cycle lane.
C)The proximity of a stretch with frequent cyclist traffic.Correct
This sign warns the driver that they are about to travel through an area where the presence of cyclists on the road is frequent. Its purpose is to prompt the driver to reduce speed, increase attention, and maintain a safe distance when overtaking them. It does not refer to a cyclist crossing (a specific crossing point) nor to a cycle lane (a road reserved solely for bicycles).