The sign indicates danger due to slippery surface...

A)In case of rain.
B)In case of snow or ice.
C)Without specifying the reason.Correct
The sign indicates danger due to the proximity of an area of the road whose surface may be very slippery (the reason is not specified).
The sign that indicates danger due to a slippery surface caused by ice or snow is the following:
The sign that indicates danger due to a slippery surface caused by ice or snow is the following: