If at a level crossing the barriers are in motion...
A)you may enter before the barriers block the crossing.
B)you must not enter, unless they are being raised and there is sufficient space.
C)you must not enter.Correct
# Explanation: Level crossings with barriers in motion
When the barriers are in motion, **you must never enter the level crossing**, without exception. Barriers in motion indicate that a train is approaching or passing, so the crossing is extremely dangerous. You must wait until the barriers are completely raised and the signal lights have stopped before proceeding.