The reflective vest of mandatory use when getting out of the vehicle in case of immobilisation on an interurban road must be visible at what minimum distance?

The reflective vest of mandatory use when getting out of the vehicle in case of immobilisation on an interurban road must be visible at what minimum distance?
A)100 metres.
B)150 metres.Correct
C)50 metres.
The approved reflective vest must be visible at a distance of at least 150 metres.