If it is necessary to warn a cyclist with audible signals, how should it be done?

If it is necessary to warn a cyclist with audible signals, how should it be done?
A)It is forbidden to use audible signals.
B)At some distance from the cyclist, to avoid startling them.Correct
C)As close as possible to the cyclist, to make sure they hear it.
When it is necessary to warn a cyclist using audible signals, it is important to do so at a sufficient distance to avoid startling them or causing them to lose control of their bicycle. Sounding the horn or any other audible device too close to the cyclist may surprise them, cause distraction or even cause a fall.