When overtaking a pedestrian, a minimum lateral clearance of 1.50 metres must be left when travelling...

A)in built-up areas only.
B)on any road, whether inside or outside built-up areas.
C)on interurban roads only.Correct
When overtaking outside built-up areas pedestrians, animals, two-wheeled vehicles or animal-drawn vehicles, vehicles immobilised on the road, or breakdown vehicles while carrying out assistance and rescue operations, the manoeuvre must be performed by occupying part or all of the adjacent lane of the carriageway.
If there is more than one lane in your direction, the adjacent lane must be fully occupied, and a lane change is mandatory when overtaking cycles, mopeds or groups of them.
In all cases the lateral clearance shall not be less than 1.50 metres.

When overtaking a vehicle other than those mentioned above, or when the overtaking takes place in a built-up area and does not involve a cycle or moped, a lateral safety margin proportional to the speed and to the width and characteristics of the carriageway shall be left.
When overtaking a cycle or moped in a built-up area, a lateral clearance of no less than 1.50 metres must be left, just as outside built-up areas.
Pedestrians in built-up areas:
As already mentioned, when overtaking a pedestrian in a built-up area, a lateral safety margin proportional to the speed and to the width and characteristics of the carriageway shall be left.

(Article 85.4 of the General Traffic Regulations and Article 35.4 of the consolidated text of the Law on Traffic, Motor Vehicle Circulation and Road Safety)