This sign...
A)Recommends the use of low-beam light.
B)Indicates the end of a stretch in which low-beam lighting is mandatory.Correct
C)Indicates that high-beam or main-beam lighting may be used.
Prior to this sign we will have found another that obliged us to use at least the low-beam light, and from this one we know that the obligation to use such lighting ends, provided that it is not imposed by circumstances of visibility, time or road illumination.