To prevent the onset of fatigue, it is advisable to stop and rest for 20 or 30 minutes...
A)every time we find a rest area on our route.
B)every 4 hours or every 400 kilometers of driving.
C)every 2 hours or every 200 kilometers of driving.Correct
# Explanation
To prevent fatigue when driving, it is essential to take regular breaks every **2 hours or every 200 kilometers**. This interval is recommended by road safety experts, as it allows the driver to regain energy and concentration before fatigue significantly affects their reflexes and reaction capacity. Longer or less frequent breaks are not sufficient to maintain an optimal level of driving safety.