What does a longitudinal broken line with very closely spaced dashes indicate?

A)A special lane.
B)The beginning of the broken line.
C)A dangerous section.Correct
A longitudinal broken line may be intended to warn the driver that they are approaching a continuous longitudinal marking with the prohibition that such marking implies, or the proximity of a section of road that presents a special risk. In these cases, the spacing between the line dashes is noticeably shorter than in the general case.