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For answer  A 

Overtaking vehicles is prohibited near the tops of ramps, when visibility is under 50 meters.

For answer  B 

Overtaking vehicles is prohibited in curves and in any other places where visibility is reduced under 50 meters. However, answer B mentions visibility reduced under 100 meters, which makes it incorrect.

For answer  C 

The “Priority road” sign does not have the role of prohibiting the performance of the overtaking maneuver and is not involved in any way in prohibiting this maneuver.

The correct answer is: A

Recommendations:

The full explanation of the sign --> Priority road

The places where overtaking is prohibited - Audio-Video Lesson --> Traffic Code - Overtaking

For answer  A 

Regulation** - Article 120

(1) Is prohibited the overtaking of vehicles:
[...]
b) near the tops of ramps, when visibility is reduced under 50 m;
[...]

For answer  B 

Regulation** - Article 120

(1) Is prohibited the overtaking of vehicles:
[...]
c) in curves and in any other places where visibility is reduced under 50 m;
[...]

For answer  C 

Regulation** - Article 120

(1) Is prohibited the overtaking of vehicles:
a) in intersections with undirected traffic;
[...]

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