Is it permitted to make a U-turn at this intersection?

Is it permitted to make a U-turn at this intersection?
A)Yes, if it covers no more than 15 metres.
B)No.
C)Yes, with due caution.Correct
As a general rule, changing direction is prohibited in places where overtaking is prohibited, unless expressly authorised by the corresponding sign.
At intersections and in their vicinity, overtaking is prohibited, unless priority is established and properly signposted.
In this case, priority is signposted by means of a traffic light showing a green light, so overtaking or changing direction is permitted, always with caution and without endangering any road user.
At roundabouts and circular traffic squares, despite being a special type of intersection, changing direction is permitted.