In a tunnel, may we carry out an overtaking manoeuvre?

A)No, under no circumstances.
B)Yes, if we do not invade the opposite direction and we have more than one lane in our direction.Correct
C)Yes, if traffic conditions allow it.
In tunnels, as a general rule, overtaking is prohibited.
If there is more than one lane in our direction of travel, it would be permitted provided we do not invade the opposite direction.
If there is more than one lane in our direction of travel, it would be permitted provided we do not invade the opposite direction.