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For answer  A 

To the driver of a motor vehicle, agricultural or forestry tractor or tram is prohibited to throw, on public roads, from the vehicle objects, materials or substances.

For answer  B 

It is allowed the opening of the doors when the vehicle is stopped or waiting on the carriageway, but on the condition of making sure before opening them.

For answer  C 

It is allowed the use of the sound system with which the vehicle is equipped, but it is prohibited the use of it at a noise level that would affect the safe movement of its driver and of the other traffic participants.

The correct answer is: A

Recommendations:

Obligations and prohibitions of vehicle drivers - Audio-Video Lesson --> Road Traffic Code - Obligations, prohibitions and aggressive driving

For answer  A 

Regulation** - Article 148

Is prohibited the driver of a motor vehicle, agricultural or forestry tractor or tram:
[...]
20. to throw, on public roads, from the vehicle objects, materials or substances;
[...]

For answer  B 

Regulation** - Article 145

Is prohibited the driver of a motor vehicle, agricultural or forestry tractor and the passengers that during stopping or waiting to open or to leave open its doors or to get off without making sure that they do not create a danger for traffic.

For answer  C 

Regulation** - Article 148

Is prohibited the driver of a motor vehicle, agricultural or forestry tractor or tram:
[...]
7. to have during driving concerns of a nature to distract in a dangerous way the attention or to use sound systems at a noise level that would affect the safe movement of him and of the other traffic participants;
[...]

** Regulation = REGULATION for the implementation of OUG 195/2002 updated (Regulation of the road traffic code)