The yellow vehicle reduces its speed because the overtaking manoeuvre being performed by the red vehicle is dangerous — is this correct?

A)No, the yellow vehicle must not change its speed.
B)No, because the vehicle approaching from the opposite direction is already warning of the danger with its lights.
C)Yes, so that the red vehicle returns to the right as soon as possible.Correct
During an overtaking manoeuvre, the driver of the vehicle being overtaken must continue to facilitate the manoeuvre. This obliges them to:
- Not increase their speed.
- Not carry out any manoeuvre that prevents or obstructs the overtaking.
- Reduce their speed when, once the overtaking manoeuvre has begun, a situation arises that poses a danger to their own vehicle, to the vehicle carrying out the manoeuvre, to those travelling in the opposite direction, or to any other road user.