Once an overtaking manoeuvre has begun, circumstances arise that may make it difficult to complete without causing risks. What is the driver obliged to do?

Once an overtaking manoeuvre has begun, circumstances arise that may make it difficult to complete without causing risks. What is the driver obliged to do?
A)Complete the overtaking manoeuvre by quickly increasing speed.
B)Brake sharply to return to the right as soon as possible.
C)Abandon the overtaking manoeuvre, quickly reducing speed and returning to their lane without causing obstruction.Correct
If, after beginning the overtaking manoeuvre, we notice that circumstances arise that may make it difficult to complete without causing risks, we shall quickly reduce our speed and return to our lane, signalling this to those following us with the required signals.