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In the intersections in which the traffic is carried out in a roundabout, signalled as such, the vehicles that circulate inside them have priority compared to those that are about to enter the intersection. Thus, when you circulate inside an intersection with a roundabout you do not have to give priority to any vehicle.

Exception are the cases in which the intersection with a roundabout in which you circulate is provided with two or more traffic lanes and for leaving the intersection it is necessary to change the traffic lane, a situation in which you have to give priority to the vehicles on that lane on which you want to move in order to be able to leave the intersection.

The correct answer is: C

Recommendations:

All about the intersection with a roundabout - Audio-Video Lesson --> Road Traffic Code - Intersection with a roundabout

Traffic in intersections - Audio-Video Lesson --> Road Traffic Code - Traffic in intersections

The complete explanation of the sign --> Intersection with a roundabout

OUG* - Article 54

(1) The driver of the vehicle who performs a maneuver of changing the direction of travel, of exiting from a row of stationary vehicles or of entering such a row, of moving to another traffic lane or of turning right or left or who is about to perform a U-turn or to move in reverse is obligated to signal in time and to make sure that he can do it without disturbing the traffic or endangering the safety of the other traffic participants.
(2) Signalling the change of direction of travel must be maintained for the entire duration of the maneuver.

OUG* - Article 57

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(4) In intersections with a roundabout, signalled as such, the vehicles that circulate inside them have priority compared to those that are about to enter the intersection.
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Regulation** - Article 107

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(1^1) In the case of intersections with a roundabout, the drivers of vehicles must respect the rules regarding traffic on lanes, having the obligation to signal in time leaving the intersection and to make sure that they can do it without disturbing the traffic or endangering the safety of the other traffic participants.
[...]

Regulation** - Article 135

The driver of the vehicle is obliged to give priority of passage also in the following situations:
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d) when he is about to enter an intersection with traffic in a roundabout compared to the one who circulates inside it;
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* OUG = Government Emergency Ordinance no. 195 of December 12, 2002 updated (Road Traffic Code)
** Regulation = Regulation for the implementation of OUG 195/2002 updated (Road Traffic Code Regulation)