This horizontal sign on the pavement indicates...

A)The maximum speed at which one may drive in this lane.Correct
B)The maximum speed at which one may drive on this road.
C)The minimum speed at which one must drive in this lane.
As the sign is located in a lane delimited by longitudinal lines, the maximum speed prohibition refers exclusively to vehicles travelling in that lane.
If the lanes were not delimited, the maximum speed would apply to the entire roadway.
If the lanes were not delimited, the maximum speed would apply to the entire roadway.