If you have slept poorly or have not slept enough, you must take into account that...
A)driving on a highway for hours prevents the onset of sleep.
B)a cup of coffee eliminates fatigue and helps you concentrate.
C)you are not in perfect conditions to drive.Correct
# Explanation
Fatigue and lack of sleep **significantly reduce your driving ability** by affecting your concentration, reaction time and vision. Although driving on a highway or drinking coffee may provide a temporary false sense of alertness, they do not replace the necessary rest. The right thing is **not to drive if you have not slept enough**, since it represents a serious risk to your safety and that of others.