On which roads is there a greater risk of monotony?

A)On motorways.Correct
B)On roads within built-up areas.
C)On conventional roads.
Driving on motorways and dual carriageways, by not requiring great demands from the driver in terms of the environment and traffic circumstances, produces in that driver a feeling of routine and lack of stimuli during driving, with the consequent risk that monotony appears and the driver's state of alertness decreases.