Is it permitted to make a stop on a dual carriageway (autovía) or motorway (autopista)?

A)Yes, but only on the hard shoulder if it is passable.
B)Yes, on the central reservation or the hard shoulder, indistinctly.
C)No, you may only stop in designated areas, such as rest areas.Correct
On motorways or dual carriageways, stops and parking must be made in the designated areas provided for this purpose, which are the rest areas or service areas indicated by these signs: