When the separation between the dashes of a broken line is noticeably shorter than normal, what may it indicate?

When the separation between the dashes of a broken line is noticeably shorter than normal, what may it indicate?
A)That this line cannot be crossed.
B)That we must reduce speed.
C)That we are approaching a section with a special hazard, possibly becoming a continuous line.Correct
A shorter distance between the dashes of a broken line will indicate to the driver the proximity of a continuous line or of a section of road presenting a special risk.