On an interurban road that has no pedestrian zone, which side must pedestrians walk on?

A)On their right.
B)Either side indiscriminately.
C)On their left.Correct
Pedestrians are required to use the pedestrian zone, except when it does not exist or is not practicable, in which case they may use the hard shoulder or, failing that, the carriageway. This must be done as follows: - On urban roads they shall walk on the right or on the left, depending on circumstances. - Outside built-up areas and on through roads, they shall walk on their left, unless it is safer to do so on the right. - Those pushing a two-wheeled cycle or moped, handcarts or similar, persons in wheelchairs, and groups of pedestrians shall walk on the right and shall obey applicable signals. - Unless they form a procession, they must walk in single file.