What does the wide broken longitudinal line indicate?

A)The proximity of a continuous line.
B)The existence of a reversible lane.
C)The existence of a special lane.Correct
As in the case of the image in the question, a special lane will generally be delimited on its outer side by a continuous, or broken, white line noticeably wider than in the general case.
The proximity of a continuous line will be indicated by a broken line with the distance between its dashes noticeably shorter than in the general case.
In the case of a reversible lane, it will be delimited on its sides by double broken markings.