What should a pedestrian do if, when about to cross a road, they find themselves facing an officer with their arm raised vertically?
A)Cross. Officers' signals only apply to vehicle drivers.
B)Stop, unless a traffic light gives them right of way, in which case they should cross.
C)Stop.Correct
# Explanation
When a traffic officer raises their arm vertically, they are indicating **mandatory stop** for all road users, including pedestrians. This manual signal has the same validity as light signals and must be obeyed without exception. Pedestrians must stop and wait for the officer to change body position before crossing.