Step 3 » GENERAL learning environment Category D (D, D1, Tb, Tv)

For answer  A  and  B 

When the visibility is reduced because of the fog, at nighttime, if you drive as close as possible to the axis of the road or as close as possible to the right edge of the public road, it is possible that the vehicles coming from the opposite direction cannot notice you in due time to avoid a possible impact, or the vehicles waiting on the right side of the road can surprise you with their presence because of the reduced visibility. 

For answer  C 

When the visibility is reduced because of the dense fog, regardless whether you drive in daytime or nighttime, you must keep an equal distance between the axis of the road and the right edge of the carriageway and move at a speed that ensures stopping within a space smaller than the one of visibility.

The correct answer is: C

Recommendations:

Preventive driving course --> Preventive driving course

Speed reduction and maximum speed limits - Audio-Video Lesson --> Road Traffic Code - Driving speed