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For answers  A  and  B 

On roads subject to speed restrictions and on roads with a single traffic lane for each direction the U-turn is permitted, but on the condition that the road signalling in that place does not prohibit this maneuver.

We draw attention that in answer B it is about the roads with two-way traffic but with a single lane on each traffic direction. It is not about one-way roads.

For answer  C 

The U-turn of vehicles is permitted in intersections, including in those with roundabout traffic. However, the U-turn of the vehicle is not permitted in the intersections in which the left turn is prohibited or in the intersections in which it is necessary the maneuvering of the vehicle forward and backward.

The correct answer is: C

Recommendations:

The U-turn maneuver - Audio-Video Lesson --> Road Traffic Code - The U-turn and moving in reverse

The direction and the traffic lane - Audio-Video Lesson --> Road Traffic Code - The direction and the traffic lane

For answers  A  and  B 

The road legislation does not provide anything in this regard.

For answer  C 

Regulation** - Article 126

Is prohibited the U-turn of the vehicle:
[...]
b) in the intersections in which the left turn is prohibited, as well as in those in which, for performing it, it is necessary the maneuvering forward and backward of the vehicle;
[...]

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