This signage recommends travelling at 70 kilometres per hour...
A)in any case.
B)only when meteorological and environmental conditions are favourable.
C)only when it is raining.Correct
It recommends not exceeding the maximum speed in km/h, due to the circumstances indicated on the lower supplementary panel. In this case, the recommendation applies in the event of rain. Panels also exist for snow and fog.
When the recommended maximum speed sign is placed below a hazard warning sign, the recommendation ends when the hazard ends.