Is overtaking permitted inside a tunnel?
A)No.
B)Yes, when the directions are separated.
C)Yes, if there is more than one lane in the same direction of travel.Correct
Even if there is no sign prohibiting it, in tunnels or underpasses with traffic in both directions, overtaking is prohibited, unless there is more than one lane for the direction of travel, in which case overtaking may be performed without crossing into the oncoming direction. Consequently, overtaking is always prohibited in tunnels, underpasses and road sections affected by the "Tunnel" sign where only one lane is available for the direction of travel of the vehicle intending to overtake.