Is overtaking permitted in a tunnel?

Is overtaking permitted in a tunnel?
A)Yes, except for oversized vehicles.
B)No, regardless of the number of lanes.
C)Yes, when there is more than one lane for each direction of travel.Correct
Overtaking is 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.