The sign you have encountered is called “Speed limit differentiated by categories of motor vehicles”. This sign obliges to limiting the speed by categories of motor vehicles as follows:
In the event that you encounter this sign you will respect the limitation imposed by it, regardless of the category of the road on which you are moving.
Therefore, in the given situation, driving a motor vehicle in category B, you have the obligation to travel at a speed that does not exceed 50 km/h.
The correct answer is: A
Regulation** - Article 121
(1) The drivers of vehicles are obliged to respect the maximum permitted speed on the road section on which they are driving and for the category to which the driven vehicle belongs, as well as the one imposed by the means of signalling.
[...]
OUG* - Article 48
The driver of a vehicle must respect the legal speed limit and adapt it according to the road conditions, so that he can perform any maneuver in safety conditions.
* 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)
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