Which of the following factors increases fatigue when driving?

A)Seats that are too soft.
B)Sunlight.
C)Traffic congestion and hold-ups.Correct
Anything that requires the driver to concentrate intensely or that makes driving more uncomfortable will cause them to tire sooner and will increase the onset of fatigue.
Driving on a road with heavy traffic promotes the onset of fatigue because it requires greater concentration to drive. Traffic jams also promote the onset of fatigue, because they can cause stress, and stress produces fatigue.
Driving on a road with heavy traffic promotes the onset of fatigue because it requires greater concentration to drive. Traffic jams also promote the onset of fatigue, because they can cause stress, and stress produces fatigue.