What lateral separation must we keep when overtaking a van with our car?

What lateral separation must we keep when overtaking a van with our car?
A)A safety margin proportional to the speed, characteristics and width of the carriageway.Correct
B)A lateral separation of no less than 1.5 metres.
C)At least 2 metres.
When overtaking outside built-up areas pedestrians, animals, two-wheeled or animal-drawn vehicles, vehicles immobilised on the road or assistance vehicles when carrying out assistance and rescue operations, the manoeuvre must be carried out occupying part or all of the adjacent lane of the carriageway.
If there is more than one lane in our direction, the adjacent lane must be fully invaded, the lane change being mandatory when overtaking cycles, mopeds or groups of them.
In any case the lateral separation will not be less than 1.50 metres.
In other cases we will leave a safety margin proportional to the speed, characteristics and width of the carriageway.