To turn left, it is mandatory to approach the left edge of the carriageway on roads that are...
A)with more than one lane for one of the directions of travel.
B)two-way roads.
C)one-way roads.Correct
If the road is one-way, to turn left the driver shall position their vehicle at the left edge of the carriageway, without encroaching on the hard shoulders, pavements, platforms, crossings or areas excluded or reserved for traffic.
If the turn is to the left but the carriageway being travelled is two-way, the driver shall keep to the longitudinal lane marking separating the two directions of travel or, if there is none, to the centre line of the carriageway, without encroaching on the area designated for the opposite direction.