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For answer  A 

Moving in reverse with the vehicle is prohibited when the visibility behind is obstructed. In such situations the vehicle can be maneuvered in reverse only when its driver is directed by at least one person located outside the vehicle.

For answers  B  and  C 

The road traffic legislation does not prohibit moving in reverse with the vehicle at night or during the day.

The correct answer is: A

Recommendations:

Turning maneuvers and moving in reverse - Audio-Video Lesson --> Road Traffic Code - Turning and moving in reverse

Places where the stopping maneuver is prohibited - Audio-Video Lesson --> Road Traffic Code - Stopping, waiting and parking

For answer  A 

Regulation** - Article 128

[...]
(2) In the places where moving in reverse is permitted, but the visibility behind is obstructed, the vehicle can be maneuvered in reverse only when its driver is directed by at least one person located outside the vehicle.
(3) The person who directs the maneuvering in reverse of a vehicle is obliged to make sure that the maneuver is carried out without endangering the safety of the participants in traffic.
[...]

For answers  B  and  C 

The road traffic legislation does not provide anything in this regard.

** Regulation = REGULATION for the implementation of OUG 195/2002 updated (Road Traffic Code Regulation)