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For answer  A 

The traffic legislation does not provide the use of the hazard warning lights when moving the motor vehicle in conditions of reduced visibility.

For answer  B 

The traffic regulation specifies that the hazard warning lights must be used in the following situations:

• when the vehicle is involuntarily immobilized on the carriageway;
• when the vehicle moves very slowly and/or constitutes a danger itself for the other participants in traffic;
• when the motor vehicle is towed.

The drivers of motor vehicles and trams must activate the hazard warning lights, successively, in the order of stopping and in the case in which this maneuver is required by the blockage of traffic on the direction of travel.

For answer  C 

The traffic legislation does not provide the use of the hazard warning lights when you voluntarily wait on the carriageway.

The correct answer is: B

Recommendations:

Correct use of the lighting and signalling system --> Traffic Code - The technical condition of vehicles and the lighting and light signalling system

Regulation** - Article 114

[...]
(5) The hazard warning lights are used in the following situations:
a) when the vehicle is involuntarily immobilized on the carriageway;
b) when the vehicle moves very slowly and/or constitutes a danger itself for the other participants in traffic;
c) when the motor vehicle or the tram is towed.
(6) In the situations provided in paragraph (5), the drivers of motor vehicles and trams must activate the hazard warning lights, successively, in the order of stopping and in the case in which this maneuver is required by the blockage of traffic on the direction of travel.
[...]

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