As a general rule, on an interurban road, stopping and parking shall be carried out...

A)on the hard shoulder, when it is passable and wide enough.
B)always on the hard shoulder.
C)always off the carriageway, on the right-hand side of it, and leaving the passable part of the hard shoulder clear.Correct
The hard shoulder of interurban roads is the area designated for the circulation of certain vehicles, such as mopeds, cycles, or vehicles for persons with reduced mobility, among others. For this reason, if we stop or park on the hard shoulder, we will obstruct their movement. Therefore, on these roads, one must always stop or park off the carriageway and off the passable part of the hard shoulder. Stopping on the hard shoulder is permitted if it is not passable. Additionally, it must always be done on the right-hand side, regardless of the directions of travel.
On urban roads, hard shoulders are normally used for parking, so they may be used for stopping and parking even if passable. If the road is one-way, it may be done on either the right or the left; if it is two-way, only on the right.