It is mandatory to finish an overtaking manoeuvre...
A)Merging into the right lane at the highest possible speed.
B)Only by signalling the lateral movement.
C)Merging into the lane gradually without obstructing.Correct
# Explanation: Finishing the overtaking manoeuvre
When ending an overtaking manoeuvre, you must merge back into the right lane **gradually and without obstructing** the traffic of the vehicle you have just overtaken. This means you must leave sufficient safety distance and not brake suddenly. It is not necessary to accelerate to the maximum or just signal; the important thing is to perform the manoeuvre smoothly and safely for all drivers.